What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. REFERRED TO LANDING GEAR HANDLE CANNOT BE RAISED ABNORMAL PROCEDURE, AND SELECTED SYSTEM 1 ON THE LEVER LOCK & WARNING SYSTEM. GEAR RETRACTED NORMALLY. REMOVED AND REPLACED PROXIMITY DETECTION BOX AND RELAY 14GB IAW M/M 32-61-12 & ESPM.