Performed heating maintenance on one heat pump system. Checked all electrical, mechanical and performance of the system. Cleared and treated drain line and washed outdoor condenser coil. I found that the common wire from the capacitor to the starter had burn marks, so I replaced the wire. I also informed the homeowner that her filter needs to be replaced ASAP; she did not have any extra filters at this time. No other major issues were found. System is on at this time.