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The elapsed time indication (ETI) shows the current value in hours for the selected FMC. In the example shown on the graphic, the ETI for the left FMC is shown.
To see the engineering data for the current faults, you can set the engineering code 100 in the scratch pad and select LSK 6R. This will show the sensor data pages.
Sensor Data Pages
This page shows engineering data for sensors which have a FAIL status on a SENSOR STATUS page. The faults show in chronological order.
This engineering information shows for each fault:
-System code

- Label code 
- Fault state 
- Failure time 
- Monitor code. 

The system code shows the failed LRU or sub-system.
The label code shows the ARINC word for the fault.
Fault state shows if the fault was steady (S) or intermittent (I). All faults are initially recorded as a steady fault. If the fault later goes away, the indication changes to intermittent.
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FMCS BITE PAGES -SENSORS
Failure time shows the GMT of the first occurrence of the fault. This time does not change if the fault goes away and then comes back later.
The monitor code shows the specific type of ARINC 429 failure.
These are the monitor codes for ARINC 429 failures:
-Rate (receive rate failure)
-Parity (parity failure)
-SSM (sign/status matrix failure)
-Reason (reasonableness failure).

The clear key only clears the engineering data for the FMC selected as the BITE source. It does not clear the data for both FMCs.
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FMCS BITE PAGES -SENSORS

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FMCS BITE PAGES - DISCRETES THIS PAGE INTENTIONALLY LEFT BLANK
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FMCS BITE PAGES - DISCRETES General
To do a check of FMCS discretes status, select DISCRETES on LSK 4L, from the FMCS BITE page.
Discretes Pages
These pages shows the current status of the analog discretes that send data to the FMC.
If the two FMCs do not agree on the status of a discrete, a highlight shows around the status field for that discrete. In the example shown on the graphic, FMC 1 does not see the right ECS PACK on.
These are the discretes that you can see on page 1:
-ECS PACK. Shows the position of the ECS flow control and shut
off valve in each pack. -ECS PACK H/L. Shows if the pack is in normal or high flow mode. -ISOL VALVE. Shows the position of the bleed air isolation valve. -COWL A/ICE. Shows the position of the engine cowl anti-ice
switches on the P5 overhead panel. -WING A/ICE. Shows the position of the wing anti-ice switches on the P5 overhead panel.
-OLEO SWITCH. Shows the airplane in the ground or air modes. This input comes from the proximity switch electronic unit (PSEU).

These are the discretes that you can see on page 2:
-FAA/JAA FLIGHT RULES - This option sets the CG for the
applicable regulatory flight rules.

737-700 MAINTENANCE TRAINING MANUAL
-KILOGRAM OPTION - This option sets the default for weight
entries on the MCDU. -MAG/TRUE - This option is not used. -SRCE/DEST IDENT. This option is used to identify the FMC. It is
always configured to left. -ASPIRATED TAT - This option is enabled when an aspirated TAT probe is installed on the airplane. -DEGREE C/DEGREE F DEFAULT. This option sets the default for temperature entries on the MCDU. -PERF CODE - This option sets the performance code for the FMC. It is normally set to 1.
　
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