I tried to replace the lights for the acc unit. I took it apart with the circuit boards and there are 3 pins that hold down the circuit board. These 3 pins seem connected to the temperature wheel. Now, when I reassembled the acc. All I get is hot hair in defrost mode, no matter what button I pushed on the acc. I tried to get the pins to go into the board, but the holes are so small ant the board has no room for maneuverability. I guess the circuit board shouldn't be moved. The acc is part of '87 560 sel. Geesh, all I wanted to do was to see at night again to know what buttons for the vent system. Any suggestions on repairing this problem?