Came out for Home Care heating/cooling check on 2019 Lennox Heat Pump with 2 zones. Verified zone board, both tstats and dampers all operational. Verified customer just changed 15x20x1 filter recently. Cleared condensate line and verified draining properly. Pan switch wired in however no wet switch or in-line switch, recommend adding for TE Standard Flood Protection. Upon pulling disconnect in air handler saw it was melted. Checked wire size and heat strip kit, all else looks good. Cause of melted disconnect appears to be loose connections on lugs. Made customer aware and recommended replacing to be able to continue checking system. Customer agreed. Replaced bad 60amp disconnect with new one, stripped wires down for new copper connections and ensured theyre tight. Found blower wheel with dust build up, recommend pulling and cleaning. Found outdoor coil with dirt and debris, recommend chemically cleaning. Verified cooling and heating operations after disconnect repair. Did find pressure