High Capacity 80 Plus, model 625.348832. Unit had been bypassed and sitting idle for a while so I cleaned the unit and replaced the venture/nozzle gasket. Put the unit back in service and ran through all of the cycles. Everything seems to be working properly with the exception of some info that keeps appearing on the display. Every 4-5 minutes the unit beeps once, then the display shows SR-21 for about 2 seconds and then shows 2.0 for about 2 seconds. The display then returns to the present time. These aren't error codes according to the manual, so I don't know what to make of it. I do not recall this particular display ever showing before when the unit was in service. Any ideas?