What was found
CLIMBING THROUGH 25,000 FEET, WITH A CABIN ALTITUDE OF 7.0, A VIBRATION STARTED THAT SEEMED TO BE COMING FROM THE FORWARD GALLEY DOOR. THE FLIGHT ATTENDANT ALSO REPORTED LOUD NOISE AND VIBRATION COMING FROM GALLEY DOOR.REPLACED DOOR SEAL IAW MM 52-41-07. FOUND CENTER PLUNGER ASSEMBLY FORK BENT. REMOVED AND REPLACED SERVICE DOOR CENTER PLUNGER ASEEMBLY WITH NEW PLUNGER ASSEMBLY IAW 52-41-00. OPS CHECK GOOD.