As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION LEFT GEAR DOOR REMAINED IN YELLOW. CYCLED GEAR PER PROCEDURE THEN THE LEFT GEAR WOULD NOT COME DOWN AT ALL. USED ALTERNATE EXTENSION, GOT ALL GREEN LIGHTS. CIRCLED AND RETURNED TO HPN. NO EMERGENCY WAS DECLARED BUT CAPTAIN DID REQUEST CFR TRUCKS. FOUND LEFT GEAR ACTUATOR UPLOCK HOOK WORN. REPLACED BUSHING, RIGGED ACTUATOR AND PROX SWITCH IAW -8 MM 32-10-21, OPS CHECK GOOD.