I can't believe this has not been mentioned yet:
People who post for Tech Help; listing all the chips, caps, resistors, diodes, and other components they have replaced in a shotgun like effort to solve a switch error, when all they had to do was adjust the switch. They make no effort to diagnose the problem, they just start replacing parts on the MPU, PDB, Sound Board, Etc. Generally, causing new problems in the process.