As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SLP - FLIGHT 4054, THE CREW REPORTED THAT AFTER TAKEOFF THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO SLP WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE ADJUSTED THE RIGHT MAIN LANDING GEAR WEIGHT ON WHEELS PROXIMITY SWITCH, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.