Cable or connection +36 V shorted.

Check / reseat the cable between LDM 1–6 and LCB connector J601.

Defective +36 V module

Replace the +36V module in the LDM (LDM slot 6). See service procedure "Replacing a Laser Drive Module".

Defective LCB

Replace the Laser Control Board (LCB). See service procedure "Replacing the Laser Control Board (LCB)".