What was found
PHX/LAX - FLT 2039 - AIR TURNBACK. AFTER TAKEOFF, LANDING GEAR WOULD NOT RETRACT. USED OVERRIDE TO RETRACT GEARS. (LEVER LATCH CIRCUIT BREAKER WAS FOUND POPPED OUT ON ARRIVAL PHX.) JACKED AIRCRAFT AND CYCLED GEAR 4 TIMES, NO FAULTS NOTED. (X)