What was found
AIRCRAFT WAS GROUNDED. UPON GEAR EXTENSION THE LEFT MAIN GEAR NEVER GOT A GREEN DOWN LIGHT. THE BULB DID NOT TEST GOOD, BUT AN EMERGENCY GEAR EXTENSION WAS MADE. A LOW PASS WAS DONE AND TOWER STATED THE GEAR APPEARED TO BE DOWN. UNEVENTFUL LANDING. AFTER LANDING THE GEAR WAS PINNED BEFORE TAXI IN. REMOVED AND REPLACED THE GREEN DOWN AND LOCKED LAMPS. PERFORMED PSEU BITE CHECK PER AMM 32-60-00 AND CHECKED MAIN GEAR INBOARD DOOR OPERATION. OPERATIONAL CHECK GOOD.