What was found
CREW REPORTED THAT MAIN CARGO DOOR WARNING LIGHT ILLUMINATED DURING LEVEL FLIGHT AT FL350. PERFORMED EMERGENCY PROCEDURE, DECLARED AN EMERGENCY AND DIVERTED. PERFORMED A NORMAL APPROACH AND LANDING WITHOUT FURTHER INCIDENT. MX FOUND THE LATCH LOCK PIN NOT ENGAGED. ANNUNCIATOR ILLUMINATED ON CARGO DOOR CONTROL PANEL. DOOR WAS LOCKED. ADJUSTED NR 1 LATCH PIN SWITCH IAW MM 52-35-01. TORQUED AND SAFETY WIRED SWITCH. OPS CHECK OF THE MAIN CARGO DOOR SHOWED ALL LIGHTS AND OPERATION GOOD. ACFT WAS RETURNED TO SERVICED.