509/510 WATER INGRESS CHECK 09 - NO. 2 END RETURN AIR DAMPER LEAK. ~~~~~ 509/510 WATER INGRESS CHECK   1509 no. 2 end return air damper insulation check, OK. Temperature setting, OK. Used venturi pump to urge, found drain pan path choked. Cleared the sludge and purged the water. A/C operation normal. Replaced saloon air filter as preventive measure. To further monitor. N.A SANKAR/SYAFIQ/02.06.21