Customer stated they had 4 power surges back to back. System was off on arrival. Turned system on and found that the pressures are good and system is cooling with a 17-18 degree temp split. Ran system for an hour and temp dropped 3 degrees in the house. Evap coil was changed 2 years ago. Out door unit is 12 yrs old. Flue pipe is single walled and in poor shape. No flood protection on unit and filter was very dirty not changed for a long time.