As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LP NR 281684-1; QRH PROCEDURE; AFTER TAKEOFF, LT GEAR RED LIGHT WAS ON, FOLLOWED QRH PROCEDURE. CLEANED DIRTY PROX SENSOR FOR LT LANDING GEAR AND CHECKED GENERAL CONDITION OF UP LOCK PROX SENSOR AND FOUND TO BE OK. PERFORMED PSEU TEST. OPS CHECK NORMAL. CHECKED GAP LIMITS AND FOUND WITHIN LIMITS.