Upon arrival tech was informed condenser for the upstairs system was making loud noise a few weeks again. Tech turned system on and was not able to have noise recreated but inspected over system. Amp draws for all motors and compressor are within specs. Temp range was reading a little low for heat pump and tech noticed heat strips were not coming on. Inspected heat strip problem and found the W wire was broken off from terminal block and capped off with wire nut. Stripped wires back and attached to terminal block and retested and heat strips came on. Tech informed homeowner that due to age of system and being R22 Freon that a replacement system is recommended over making major repairs. Customer would like first maintenance done around middle of spring time so upstairs can be inspected in cooling mode. System is back operational at this time.