I still lean toward the switches Matt. The fronts are located at the optimal location to have something spilled on them, while the rears are high in the door. Anyone spill a little coffee or soda lately? Might be worth trying to clean them out with some CRC contact cleaner.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.