Mitsubishi ws55809 has code 23

This unit will not turn on green light for one second then off code 23.I have taken apart this unit and ohmed out all I could.The pico fuses are good but are the ics bad.I have checked all I can as far as cans one thing I noticed all the heat sinks are connected to the board electrically except ic9580 reg.Should I change the ic's some pins seem to have higher resistance.Thanks in advance.