What was found
WHILE AT CRUISE: PROP REVERSE NOT READY ANNUNCIATOR ILLUMINATED, LEFT MAIN LANDING GEAR GREEN INDICATOR ILLUMINATED THEN WENT OUT, LANDING GEAR IND C.B. (COPILOT PANEL) POPPED AND WOULD NOT RESET. LANDING GEAR GREEN INDICATIONS DID NOT ILLUMINATE WITH HANDLE DOWN. - DISCOVERED BROKEN AND EXPOSED WIRES ON LH MLG DOWNLOCK SWITCH WIRING HARNESS. REMOVED OLD SWITCH ASSY (PN: 101-364628-1) (SN: 10457715D) AND REPLACED WITH NEW SWITCH ASSY (PN: 101-364628-1) (SN: 11978383E). OPS CHECKED GOOD AT THIS TIME. NO BREAKERS POPPED AND 3 GREEN DOWN INDICATIONS SHOWN. WORK DONE IAW KING AIR B300 MM CH. 32-60-05.