Looked in return and supppy for water damage and Possibly microbial growth or damage to plenums. No growth or water damage found. Serviced unit. Recommend cleaning drain line and replacing pitted Contactor. Some ductwork was recently replaced. Checked blower wheel, run capacitor, dual capacitor, Contactor, condenser coil, heat strip and compressor amp draw and fan motor amp draw. Also recommend adding wet switch in drain pan in addition to the float switch that is already there.