(d)  
If you find wear or damage to a service panel component, do the related maintenance procedure and replace as necessary. (AMM 38-32-81/201 and AMM 38-32-81/401).

 (e)  
Do not close the drain valve assembly.

 S 616-070
 WARNING:_______DO NOT OVERFILL THE SYSTEM WITH WATER. CONTAMINATION OF ELECTRICAL EQUIPMENT WITH WATER CAN CAUSE SERIOUS DAMAGE TO COMPONENTS AND HAVE AN UNWANTED EFFECT ON THE FLIGHT SAFETY OF THE AIRPLANE.
 (7)  
Fill the forward toilet system with water until the lavatory bowl is half full with water (AMM 12-17-00/301).

 S 016-012

 (8)  
In the forward lavatory, remove toilet shroud assembly, as given when you do the removal procedure for the toilet waste tank. (AMM 38-32-51/401).

 S 216-013

 (9)  
In the forward lavatory, do a full visual inspection of the components that follow:

 (a)  
Toilet tank.

 (b)  
Toilet-tank catch basin, if applicable.

 (c)  
Drain adapter (floor).

 (d)  
Drain valve and gasket seal

 (e)  
Toilet flush motor-pump-filter assembly and gasket seal

 (f)  
Ground flush-hose connection

 S 966-014
 (10)
 If you find the toilet tank is damaged and has a leak, replace the toilet tank (AMM 38-32-51/401).

 S 166-015

 (11)
 If you find unwanted material or a blockage of the drain in the catch basin, clean as necessary.

 S 966-016

 (12)
 If you find the toilet drain adapter is cracked or damaged, replace with a new adapter.

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737-300/400/500MAINTENANCE MANUAL
 S 966-018
 (13)
 If you find a leak in the drain valve gasket, on the top of the toilet tank, replace the gasket. (AMM 38-32-31/401).

 S 966-019

 (14)
 If you find a leak in the gasket of the toilet-flush motor-pump-filter assembly, replace the gasket. (AMM 38-32-21/401).

 S 426-020

 (15)
 If you find a leak at a ground flush-hose connector, tighten the connector or replace the tubing (AMM 38-32-42/401).

 S 016-021

 (16)
 Disconnect the service-cart toilet drain connection from the forward toilet service-panel.

 S 016-022

 (17)
 Do not close the drain valve assembly at the forward toilet service-panel.

 S 716-023

 (18)
 On the forward toilet service-panel, do the applicable step that follows:

 (a)  
Make sure the drain plug is removed, on the service panels with no levers for a flapper valve.

 (b)  
Make sure the OPEN lever is set so the flapper valve is open, on service panels with OPEN/CLOSE levers.

 (c)  
Make sure the PUSH-TO-OPEN lever is set so the flapper valve is open, on service panels with PUSH-TO -OPEN levers.

 S 026-024
 (19) On airplanes with the toilet-drain ball valve installed: Disconnect the toilet drain-valve control-cable (toilet tank to ball valve) from the clevis link on the drain ball valve.
 NOTE: This action keeps the toilet-tank drain valve in the closed
____ position and the control of the ball valve is by the tank drain-valve handle on the forward toilet service-panel.
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737-300/400/500MAINTENANCE MANUAL
 S 866-025
 (20) This step is applicable to only airplanes with the toilet-drain ball valve installed: Pull the tank drain-valve handle on the forward toilet service-panel and lock in the open position.
 NOTE: This opens the ball valve in the drain tube.
____
 S 216-026
 (21) If you see water in the drain tube, do the steps that follow:
 (a)  
This step is only applicable to airplanes with non modular lavatories: Before you continue, make sure the water is not from the waste-water drain on the lavatory floor, which connects to the toilet drain tube.
　
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