I have a 168 that is acting weird.  It does not recognize tray A and if you press an item on any of the other trays it will vend two items.   For example if you purchase B4 it will also vend B2, or if E 5 then also E3.    I tried a different coin mech without success.  I have replaced the vend tray interface, the harness to tray A, the main cabinet Harness and most recengtly I replaced the main control board.  Any suggestions?   Thank you for your help.

Hello, I just bought a used 276E, it has the S3D board.  When you first start the machine the display reads "Set Model Number"   I have never seen this before.  But nothing will configure such as Multi price or price setting.   My question - how do you set the model number?   I tried a new control board, but get the same message.  HELP !