What was found
AFTER T/O SELECTED GEAR UP GOT GEAR DISAGREE AND NOSE DOOR OPEN (W) MS GS AND NOSE GEAR WOULD NOT RETRACT. RAN QRH FOR NOSE DOOR OPEN ALL (W) MSGS DISAPPEARED AIRCRAFT REMOVED FROM SERVICE INSPECTED NLG DOORS, NO DEFECTS NOTED, NO HYD LEAKS NOTED. INTERROGATED PSEU RCVD CODES DI14 DOWN ON, DI15 DOWN ON,S23DOWN FAR, S22DOWN FAR, S30DOWN FAR, S31DOWN FAR, S32DOWN FAR, S21DOWN NEAR, S35DOWN NEAR. GEAR WAS PINNED IN DOWN POSITION AND PLACED ON MEL. FOUND TOW GUARD COLLAR SLIPPED AND DAMAGED CENTER PROX SWITCH BRACKET COMPLY WITH THE WORK INSTRUCTONS OF EO E19/016/432 ORG R/R'D NLG CENTERED/EXTENDED PROX SENSOR SUPPORT BRACKET PER AMM 32-61-05 SET SENSOR GAP PER AMM 32-61-05 PEROFMRED RETRACTION EXTENSION FUNCTIONAL TEST OF LANDING GEAR IAW TASK 32-30-00 OPS CK GOOD