What was found
UPON GEAR DOWN HAD A VIOLENT SHUDDER LIKE ACFT HIT SOMETHING & LOUD NOISE, THEN COULD NOT GET RT MLG DOWN ON PRIMARY OR SECONDARY SYS. LOST NR 1 TRANSPONDER, INTERMITTENT LOSS OF OTHER SYS: AUTO FLT, CAC, ETC. MLG HELD AT LANDING BUT STILL HAVE RED MLG LIGHTS AND ANTISKID FAIL. REMOVED & REPLACED RT MLG RETRACT CYLINDER AND RH MLG DOWN-LOCK CYLINDER PER MM PROCEDURES. ALSO REMOVED & REPLACED BOTH PRIMARY AND SECONDARY SENSORS AND ACCOMPLISHED GEAR SWING IAW MM PROCEDURES. ACCOMPLISHED ERA 05-32-075 NDT INSPECTION ON THE AFFECTED AREA BEFORE DEPARTURE, NO DEFECTS FOUND.