What was found
WITH BATTERIES DOSCONNECTED, ATTEMPTED TO OPEN MAIN CABIN DOOR. DOOR DID ITS NORMAL FREEFALL BUT STOPPED 2/3 OF WAY DOWN. CONNECTED BATTERIES & ELECTRONICALLY BROUGHT DOOR BACK UP & SHUT IT COMPLETELY. ATTEMPTED TO OPEN DOOR FROM OTSIDE & ONLY UNSEATED FROM FULLY CLOSED & REMAINED OPEN ABOUT AN INCH OR TWO. WITH APU OFF & ATTEMPTED TO OPEN DOOR. IT NEVER WENT FURTHER THAN 2". REMOVED AND REPLACED MCD ACTUATOR IAW GL MM 52-11-25 OPS CHECKS GOOD S/N OFF/ON F0558/F0581