What was found
NO DOWNLOCK INDICATION FOR LEFT MAIN GEAR ON FIRST ATTEMPT. SECOND ATTEMPT NORMAL. PER CREW VERBAL FLAPS STEADY AT 20 DEGREES CREW OBSERVED GEAR PAGE WITH NO LOCK INDICATION PRIOR TO STATUS MESSAGES. ONCE GEAR STABLE IN UP POSITION, 2ND ATTEMPT NORMAL, 2 MILES FROM LANDING. BASED ON INDICATIONS IN FLIGHT IT APPEARED THE LT MLG DOOR WAS OPEN BUT THE LT GEAR DID NOT EXTEND. RT MLG AND NLG INDICATED DOWN AND LOCKED. AIRCRAFT WAS JACKED AND LANDING GEAR WAS CYCLED SEVERAL TIMES WITH NO DEFECTS OR ABNORMAL INDICATIONS NOTED. THE LT MLG DOOR OPERATED SEQUENCE VALVE WAS REPLACED AS PRECAUTIONARY. AIRCRAFT HAS FLOWN SEVEN FLIGHTS AS OF THIS ENTRY WITH NO PROBLEMS.