The real test is to clear the code, then while powering up meter on the AC 110VAC range:|
DC Power Supply CN203-2 to positive
DC Power Supply CN201-1 to negative (HL1)
then DCPower SupplyCN201-3 to negative (HL2)
If you're getting no voltage then it's the power supply.
If you're getting your voltages (~100v), but still no lamps lit it's the harnass or something in the lamp circuit.
If you're getting your voltages, lamps light, but error out after ~30 seconds it could be the thermistors, the PCU, harnass to thermistors, or the thermistors may not be contacting the roller.