As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4178 - AFTER LANDING GEAR WAS RETRACTED, THE LEFT MLG INTRANSIT LIGHT REMAINED ILLUMINATED. CREW CYCLED GEAR SEVERAL TIMES WITH NO SUCCESS. AIRCRAFT RETURNED TO FIELD, AND LANDED WITHOUT FURTHER INCIDENT. OUT STATION MAINTENANCE CLEANED THE LEFT AND RIGHT UPLOCK MICROSWITCHES IAW STD MAINTENANCE PRACTICES. GROUND CHECKED GOOD, AIRCRAFT RETURNED TO SERVICE.