What was found
GEAR DISAGREE NOSE GEAR REMAINS DOWN & LOCKED WHEN GEAR SELECTED UP. FOLLOWED QRH, MANUAL RELEASE HANDLE WOULD NOT STOW. GEAR DOWN & LOCK THREE GREEN PRIOR TO LANDING. FOUND TOW GUARD COLLAR LOOSE & HAD MADE CONTACT WITH NOSE STRUT CENTERED & EXTENDED SENSOR BENDING THE MOUNT BRACKET. NO DAMAGE NOTED TO THE SENSOR. REPLACED BRACKET PN OFF ON 16215-105 NSN IAW CMM 32-20-04. REMOVED & REINSTALLED TOW GUARD COLLAR REFERENCING INSTRUCTION PROCEDURES IN PA 32-066A. SCENARIO 1 OF PA 05-18L COMPLIED WITH. RIG CHECK OF PS14 GOOD IAW AMM 32-61-05. EXTENSION & RETRACTION TESTED GOOD IAW AMM 32-30-00. ACFT OK FOR SERVICE AT THIS TIME.