As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEP F/O WENT TO RAISE GEAR, GEAR HANDLE WOULD NOT GO PAST OFF. F/O PULLED LEVER LATCH TO RAISE GEAR. ON FLAP RETRACTION WARNING HORN SOUNDED ON FLAPS UP, COMPLIED WITH ABNORMAL PROCEDURES. REMOVED & REPLACED LANDING GEAR ACCESSORY BOX IAW B727 MM 32-09-121 SYS OPS CHECKED GOOD PER SAME RII EMP 35944.