As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN PILOTS REPORTED THAT THE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. MAINTENANCE JACKED AIRCRAFT ON RAMP AND PERFORMED 6 GEAR RETRACTION AND EXTENSION CYCLES WITH NO FAILURE. CHECKED SQUAT SWITCH CONNECTORS FOR SECURITY, FOUND OK. PERFORMED 1 MANUAL EXTENTION AND 2 MORE. REFERENCE MM 32-20-00 OPERATIONAL CHECKS WERE GOOD.