What was found
LOUD NOISE FROM NOSE LANDING GEAR AREA HEARD AFTER GEAR RETRACTION, RAN QRH, CYCLED GEAR NOISE PERSISTED.(CAPT SAID GEAR LOCKED DOWN AND HE RETURNED BACK TO FIELD WITH AIRCRAFT) R&R'D NOSE DOOR SEQUENCE PROX SWITCH IAW 32-63-05-700-803-A AMM. SWUNG GEAR 8 TIMES GEAR DOORS CLOSED. OK FOR SERVICE.