I was on a flight recently (AA 705) and a maintenance worker used a forklift to go on top of the plane shortly before the captain announced that we were going to have to wait at the gate for an extra 25 minutes while they filled a hole with putty near the tail of the plane. The aircraft was an A321.
Can anyone tell me what was wrong with the plane? The pilot said it was a common problem and part of routine maintenance. I am wondering if this is a maintenance issue that an A321 expert would immediately recognize as part of routine maintenance or a problem common to these aircraft.