Tech found aux pan is rusted and recommended having pan replaced along with adding eztrap and overflow safety to primary pan to help prevent water from backfilling in the future. Tech also recommends adding drain insulation to prevent condensation in attic. Will need aux pan for 3 ton air handler and about 10ft of insulation. Tech returned and completed all repairs listed. System is back on and cooling properly at this time. No issues with drainage. All is good at this time.