Tech arrived for a warranty tuneup*2. It was cold outside. Upon inspection, the capacitors were within specs. The contactor was in working condition. The Deltas were within range. The main system filter was replaced. The drains were clear and bleach was poured. The bedroom system evaporator coil was very dirty. The drain treatment strips were expired. The system did not appear to have Surge Protection. The customer was informed of recommendations today. He decided to move forward with replacing the drain treatment strips and coil cleaning on the master bedroom system. These actions were performed and photos were taken of the work. #IAQ The systems were functioning upon departure.