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TruTrak EFIS GP issues

My Tru Trak EFIS has the following issues: It seems now to "forget" the time (GMT and Local), and also the trip timer and also to "forget" total fuel quantity, after shut down. Upon restart those units go to local time 17:00, fuel total goes to .9 gallons (regardless of the total fuel on board) and the trip timer goes to -18.06 minutes. Makes no sense. One friend suggested that it sounds like an internal battery needed for memory may be inoperative. The installation manuals don't mention this. Does anyone know if this might be true and if so what the proper replacement battery would be and where it is located and how to change it out?
I have a call into Bendix King on this issue and have not heard back as yet, so I thought I would throw this out there among this outstanding group and see if anyone might know.
Thanks!
Mark Donahue
RV 9A
 
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