I've had this Ab800 for about 2-3 years. On average I use it about once every 3-4 months. It definitely has not been used heavily. It was stored in a closet and has only been used outside twice last summer. I'll probably just sell it and go back to speedlights as they are more convenient for what I do anyway.
Alienbees have a 2-year warranty so you might still be under warranty or close to it. I would call Paul C. Buff, Inc. and ask them about their turnaround. They can look up the age of your B800 by the serial number. I haven't heard complaints about their customer service since Paul died. The only complaints I've seen were about the availability of the PLM umbrellas and the versions they stopped carrying.