Tech arrived at a warranty tuneup. Upon inspection the capacitor was within specs. The contactor was in working condition. The surge protector was functioning. The Delta was within range. The Filter was dirty and replaced. The drain was clear and bleach was poured. The UV bulb was not functioning. The customer was informed of recommendations today. He decided to move forward with replacing the existing UV bulb. The bulb was replaced, tested, and working. The system was functioning upon departure.