What was found
CLIMBING THROUGH 35,000` DISTINCT THUMP UNDER COCKPIT, & NLG RED UNLOCK LIGHT CAME ON. THERE HAD BEEN PREVIOUS NLG MX WORK DONE. SLOWED TO 210 K & NOTICED SEVERAL SMALLER THUMPS, LIKE MLG WAS CYCLING TOWARD DOORS. AT 16,000' ONE MORE THUMP & UNLOCK LIGHT WENT OUT. LOWERED MLG & IT EXTENDED NORMALLY. REMOVED UPPER & LOWER BARREL ASSY & INSTALLED INSPECTED UPPER AND LOWER BARREL ASSY IAW CMM 32-20-00 PERFORMED LANDING GEAR OPS CHECK REF AMM 32-50-00 WITH NO DEFECTS NOTED AT THIS TIME. PERFORMED NOSE WHEEL STEERING TRAVELING FUNCTIONAL CHECK WITH NO DEFECTS NOTED AT THIS TIME. REF TASK 32-50-00-720.