I completed a category 3 tune up on the whole system. I cleared the drain as well. A/H- my delta-T was at 20° with supply temperature of 54.3°. Found that pure X UV light bulb needed to be replaced, customer said it's been over two years. J went ahead and replaced it for him. The capacitor is starting to go weak. ( it's a 7.5 mfd road 7.17 mfd). C/U-fan motor is slightly over amping. (Amp draw was .83 and its rated for 0.8 amps.) Everything else checked out to be in proper working condition. I left the system in proper working condition.