What was found
INSPECTION TYPE:NA**ATB**NO EMERG DEC'D** A/C LANDED W-OUT INCIDENT** AIR TURN BACK: ABOVE 10,000' FEET ACCELERATING GREATER THAN 290 KTS A CONTINUOUS AIRFRAME BUFFET/VIBRATION WAS EXPERIENCED. SEEMS TO BE SPEED RELATED. SOURCE DOES NOT APPEAR TO BE ENGINE VIBRATION HOWEVER COULD NOT DETERMINE OTHERWISE #1 CONT/S PER AMM 05-51-38-202 PARA (B) (H) FOUND # R/H PACK EXHAUST DOOR ATUATOR FROZEN IN CLOSET PORTIO REMOVE AND REPLACED R/H PACK EXHAUST DOOR ACTUATOR REF B767 AMM 21-53-104-401 B767 AIR 21-53-02-01A ITEM 325