What was found
MQY - AIR RETURN, FLIGHT LEVEL 330, 0155Z. HEARD AND FELT VIBRATION IN COCKPIT, DESCENT TO FLIGHT LEVEL 190 AND 230 KNOTS, GEAR UP LATCH CHECK, SMALL CHANGE IN VIBRATION. NO WARNING LIGHTS ON, LANDING GEAR LEVER UP. JACKED ACFT AND ACCOMPLISHED NOSE GEAR RETRACTION. FOUND FWD DOOR LT ROD OUT OF ADJUSTMENT. ADJUSTED ROD IAW MM 32-22-1. OPS CHECK AND RII COMPLIED WITH.