Yeah this is a tough one. IIRC, that PAL fault has to do with a mismatch with Logic and Program. We had a unit that only on car top inspection, if you opened an intermediate hall door, boom…PAL and then you were stuck on the car top until a disconnect power cycle was introduced. PITA.
Otis said at the time we had to remove the bad board, send it in and they’d fix the issue. Not sure how this turned out as it was years ago, but a three week down car didn’t sound too appealing to the customer.
Good luck.
