As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7228 - AFTER TAKEOFF MEI-ATL - CYCLED THE GEAR UP AND THE GEAR DID NOT RETRACT. CREW DECLARED A PRECAUTIONARY EMERGENCY AND RETURNED TO MEI, WHERE LANDING WAS MADE SAFELY AND WITHOUT INCIDENT. REMOVED AND REPLACED LEFT 'A' UPLOCK PROXIMITY SENSOR. PERFORMED GEAR SWING AND DETERMINED PROPER OPERATION. AIRCRAFT WAS RETURNED TO SERVICE. (M)