What was found
CLIMB PAST FL340, MLG UNLOCK LIGHT ILLUMINATED. NLG BEGAN TO REPEATEDLY CYCLE, ATTEMPTED UPLOCK. RESULTED IN A BANGING FROM NLG, MEASURABLE VIBRATION, & RESULTED IN INABILITY TO UTILIZE AUTOPILOT. DESCENDING THROUGH FL180, ISSUE CLEARED. ON GEAR EXTENSION, THREE GREEN, NO, LT, & RT, UNLOCK REMAINED EXTINGUISHED. APPROACH & LANDING NORMAL. FOUND A BROKEN BOLT ON LT LOWER ROD END ASSY. REMOVED & INSTALLED NEW ROD END ASSY. MEASURED DISTANCE BETWEEN FLATS OF UPPER & LOWER BARRELS ON NLG & FOUND IT TO BE 9.95" IAW MM 32-00-00, STEP 7. PERFORMED REPACK OF NLG, SWUNG GEAR, LEAK & OPS CHECKED GOOD. WORK DONE IAW CMM 32-20-01, AMM 32-00-00 & 32-20-00.