What was found
CA WINDOW HISSING NOISE INFLIGHT SUSPECT OVERHEAD DRIP SHIELD DRAINS SOURCE OF NOISE, FLUSHED TUBES AND CHECKED FOR BELLY DRAIN VALVE OBSTRUCTIONS. ACCOMPLISHED AIRCRAFT PRESSURIZATION TO 4PSI DIFFERENTIAL. DRAIN TUBE EXIT AIR NOISE STOPPED AT 2.5 PSI. LEAK CHECKED (HEK FLUID) EXTERIOR WINDOW SEAL AREAS, NO LEAK OR NOISE.