What was found
PRESSURIZATION LEAK IN AREA OF MAIN CABIN DOOR. AUDIBLE NOISE CAME ABOUT QUICKLY, CABIN ALTITUDE BEGAN TO RISE AND CONTINUED TO RISE UNTIL STABILIZED AT 10,000 MSL (0 DIFF). DOOR SEAL ANNUNCIATOR NEVER ILLUMINATED. WHILE TROUBLESHOOTING, FOUND A LOOSE HOSE CLAMP ON CABIN DOOR SEAL PRESSURIZATION VALVE. ALSO FOUND BLEED AIR HEAT DUCT IMPROPERLY POSITIONED, CAUSING CABIN DOOR SEAL VALVE TO FORM ICE.