As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5010 - PILOTS REPORTED THAT AFTER TAKEOFF THE LT LANDING GEAR WOULDN’T RETRACT. RED LIGHTS REMAINED ILLUMINATED. MAINTENANCE CLEANED THE LEFT HAND MAIN LANDING GEAR SEQUENCE VALVES. OPERATIONALLY PERFORMED GEAR SWINGS 5 TIMES. NO DEFECTS WERE NOTED. REFERENCE EMB-120 MM CHAPTER 32-30-00. AIRCRAFT RETURNED TO SERVICE.