During the power outage recovery, Nutsinee had difficulty getting the HEPI Pump Servo to not fault out in the corner station.  We traced that to the level continuing to trip so she and Sheila lowered the level sensor on the reservoir.  The servo managed fine after that.  This morning the level is less than 1/16" lower than my latest level reading from last Tuesday.  It is cooler today and this fluctuation is within typical temperature fluctuations. So, I don't suspect a leak although I will visually check all the lines for signs of a leak tomorrow.  Neither do I suspect an accumulator leak although the abrupt pressure shift from the outage may have jarred the gas charge side schraeder valve.  I would be more inclined to suggest an air buble that was caught somewhere finally managed to burp its way out lowering the volume level.  And finally, since the level sensor setting is invasive and blind, I likely had it set very close to the trip point and Nutsinee suffered the worst of it.