As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, THE CREW NOTICED THE AIR/GROUND ANNUNCIATOR ON AND COULD NOT RETRACT THE LANDING GEAR. THE AIRCRAFT RETURNED FOR LANDING AND MAINTENANCE FOUND THE SHOCK STRUT WOULD NOT FULLY EXTEND THUS NOT ACTUATING THE AIR GROUND (WOW) SWITCH.