What was found
ON CLIMB-OUT OF PHX EN ROUTE TO RNO AT FL 200, FELT STRONG AIRFRAME VIBRATION ASSOCIATED WITH A WITH A LOAD RUMBLE, REDUCED SPEED FROM 340 KTS TO 320 KTS AND VIBRATION WENT AWAY, LANDING LIGHTS RETRACTED AT FL 100. MAINTENANCE PERFORMED ELEVATOR FREE PLAY CHECK; LT AND RT ELEVATOR SERVOS ARE WITHIN LIMITS. FOUND RT MLG RAMP DOOR MAIN ATTACH POINT HOLES ELONGATED CAUSING DOOR TO VIBRATE, REMOVED AND REPLACED RT MLG RAMP DOOR ASSEMBLY IAW T/C R4M32308. ALSO, REPLACED BUSHING ON LT MLG FIXED DOOR LOWER ATTACH POINT, OPERATIONAL TEST AND CLEARANCE CHECKS WERE GOOD.