— Tech leak searched the evaporator coil with two leak detectors to confirm previous diagnosis, finding no leaks or refrigerant residue. — Checked refrigerant charge according to PT chart, finding accurate refrigerant charge and no challenges heating or cooling. — Tech advised customer of rust formation on the coil and proposed replacing the coil while still under warranty before a leak develops in the future. Customer opted not to replace the coil at this time. — Confirmed proper heat strip and defrost operation. System is operating normally at this time. No charge per recent visit.