What was found
PILOT REPORTED, LEFT MLG DOES NOT INDICATE DOWN AND LOCKED WITH GEAR HANDLE DOWN. CYCLED GEAR 3 TIMES. ERM CHECKLIST COMPLETED WITH REQUIRED VISUAL FLY BY (CHANGED BULBS-DID NOT WORK). FOUND PLUG P1-213 LOOSE AND CONTAMINATED. CLEANED AND SECURED PLUGS AND PINS ON SWITCH PS1-208 AND REINSTALLED PLUG. CKD INSTALLATION AT S1-208 MECH SWITCH PER M/M 32-60-00 PG 201. LEFT MAIN DOWN AND LOCKED INDICATON NOW NORMAL.