As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KTPA/KATL - FLT 103/18 - LANDING GEAR WOULD NOT RETRACT ON TAKEOFF. PERFORMED LANDING GEAR EXTENSION AND RETRACTION CHECK PER MM 32-31-0 WITH AIRCRAFT ON JACKS. NO FAULTS NOTED. CYCLED GEAR MANY TIMES. GEAR AND INDICATION SYSTEM OPS CK OK. VERIFIED A-SYSTEM HYDRAULIC OPERATION FROM BOTH ENGINE PUMPS. OPS CK NORMAL. NO FURTHER INDICATION OF RECURRENCE ON SUBSEQUENT FLIGHTS. (X)