I changed the packing on a tac 20 and left power off for 2 days b/c I had the wrong size and had to overnight the correct packing.

I finished the repack and turned power back on and the elevator:
1) will only run on inspect.
2) will level up or down to a floor but always about 2 inches low.
3) I swapped the selector with a known good
4) I swapped all the 24vdc & 110vac relays with the exception of the 12 at the bottom of the main controller board. (there are 12 and some of them control the valves)

I was told that the battery on the cpu may not have had enough power to hold the programming for 2 days, would this cause the problem I have? What else could it be?