AC Diagnostic System: Refrigerant Type R410A Metering Device- TXV SP/HP 135/335 SLT/LLT 54/98 VSAT/LSAT 45/105 SH/SC 12/8 Outdoor Entering Air Temperature 94 Filter Size(s) 20x25x4 Returned tstat to original settings: Y Unit operational; prior to leaving: Y Customer stated that thermostat was blank and unit was not on. Went up to attic and checked safety switches and they were clear, checked door and door was on right but not operational. Opened up panel and checked voltage from the main and was getting 0v went to light switch and switch was off. When flipping light switch unit came on. Ask customer if some has been up there lately that could of turned that light off or maybe bumped into it. Customer said no and that we were the last ones there. Let customer know if we were the last ones there the unit couldn’t have been working since then. Office approved no service charge for this time but if another issue occurs there will be a service fee. Customer did not want to sign anyth