Odometer stopped

My daughter's 1996 Accord 4 cyl, auto, 107,000 miles, just had an oil change with a questianable mechanic. 37 miles after leaving the shop, the odometer stopped, then started, then stopped. The speedo is fine.
My Haynes manual doesn't mention the speedo or odometer.
My Honda CD is just as helpful.

Do you have suggestions?
Where would I find complete schematics for this car?
Tip follows.

Thanks,
Bill