Re: power pack repl.
Power pack problems usually manifest themselves in other ways, intermittent performance problems, false alarms etc.
Some testing needs to be done before determining the brain has a problem.
I tested for days on an intermittent water in fuel alarm before sending mine off to DFI Technologies for a rebuild.
When I called them and told the tech what I had tested, he confirmed it was a known power pack failure, I shipped the unit to them and had it sucessfully repaired. No problems since.
What makes you believe you have a power pack problem?