3 stop front only. When car travels to top floor it always lands perfectly level. As doors open and car is stopped the elevator decides to level up about 1" and back down to within 1/4" from perfect level. This happens intermittently with or without a load and only at top floor. When this happens at controller I see it not seeing 61 N even though I know it should because car is always perfectly level. It never is below level. DBG is good,tape is aligned properly, sees 77 U every time. I've ruled out valve because it would have this problem going up to a different floor. I've set floor flags so that fine floor adjustments don't even need to be made. I've done hoistway learn and decel learn several times with no fix. Never records a fault.

I'm not one to ask for help but....HELP!!!