As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LG RETRACTION FAULT SYS NR 1, GEAR REMAINED DOWN. RETURNED FOR LAND. CANNOT OPEN THE LT LG DOOR ON GND. RT LG DOOR OPENED OK ON GND. R&R LG NORMAL CONTROL MICROSWITCH UNIT 2GA PER AMM 32-31-11-04. R&R LANDING GEAR SELECTOR VALVE 3GA PER AMM 32-31-12-04. PERFORMED LG ELECTROVALVE 3GA INSPECTION/CHECK WITH THE SIMULATOR TEST SET PER AMM 32-31-12-06 FOUND SATIS. ALL LG DOORS OPENED AND CLOSED CORRECTLY, NO LEAK. PERFORMED LG WARNING TEST & ANNUCIATOR LIGHT TEST PER AMM 32-61-00-05 FOUND SATIS. ITEM CLOSED. A/C OK SERVICE.