As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - INFLIGHT T1246/02 AFTER TAKEOFF GEAR FAILED TO RETRACT. RAN QRH WITH NO SUCCESS. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. FOUND HYDRAULIC BY PASS HANDLE EXTENDED. ADJUSTED LOCK LATCH TAP SPRING IN LOCKING LATCH. STOWED AND LOCKED HANDLE. SYSTEM GROUND CHECKED NORMAL OPERATION.