What was found
INITIAL - AFT CARGO LIGHT ON, ALTITUDE FL350, LOSS OF PRESSURE CONTROL, CABIN ALT WARNING HORN AND LIGHT ILLUMINATED, CABIN ALT READING 14000FT FOLLOWED THE QRH, INFLIGHT RETURN TO KLAS EMERGENCY DECLARED - VARIFIED AFT CARGO DOOR OPERATION, NO DEFECTS NOTED, DOOR OPENS AND CLOSES NORMAL. BITE CHECKED BOTH CABIN CONTROLLERS FOUND FAULTS FOR EXCESSIVE LEAK AND HIGH CABIN ALTITUDE