What was found
INSPECTION TYPE:N/A**ATB - NO EMERG DECL'D - NO EMERG EQUIP USED** ON TAKEOFF ROLL NOTICED A THUMP NOISE. RETRACTED GEAR & RCVD A GEAR DISAGREE EICAS, WITH VIBRATION. COMPLETED QRH GEAR EXTENDED WITH ALT GEAR EXTENSION.R/R NLG RETRACT ACTUATOR IAW MM 32-34-01. COMPLETED AMM 32-34-01-404-008 STEP F6 - STEMP F14 USING AIRPLANE NO ON JACK METHOD. STEPS G1 & G2 COMPLETED. COMPLETED AMM 32-34-03-004-037 STEP 7C - STEP 24. RMVD DOOR LOCKS &CLOSED DOORS IAW MM 32-34-01-404-008 ST G3. M746439 CLOSED. DMP REV. IPC 32-34-01-02-500L