As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 4194 - LEFT MAIN LANDING GEAR WOULD NOT LOCK IN THE UP POSITION AFTER TAKEOFF, RED INTRANSIT LIGHT REMAINED ILLUMINATED. AIRCRAFT RETURNED TO THE FIELD, LANDED WITHOUT FURTHER INCIDENT. PIT MX CLEANED AND LUBRICATED THE UPLOCK ROLLERS IAW MM 32-00-00 AND STD MX PRACTICES. GROUND CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.