while heading home and plugging in (115V 15A in not-freezing but cold garage) noticed a small squeaking noise that sounds almost like a steady cricket - this is in tandem with the normal hum & whirr as coolant circulates through the battery. may have noticed at the last stoplight by home, but certainly after pulling and plugging in. coolant seems to be moving fine, but sound is coming from the general vicinity of the coolant tank at the right side of the PEM. nothing else abnormal that i've picked up yet. could this be anything special, or maybe just a loose connect that squeaks now (perhaps louder than it used to:smile?