What was found
AT FL450 LOST CABIN PRESSURE. CABIN CLIMB RATE +5500 FPM. AMBER CABIN ALT FO SAW CABIN AT 9500. INDICATED EMERGENCY DESCENT. DIVERTED INTO KNEW. CABIN OXYGEN MASKS USED. VISUALLY INSPECTED INSIDE TAIL COMPT FOR ANY LOOSE DUCTS, BLOWN DUCTS, LOOSE COUPLINGS ETC, NONE FOUND. REMOVED CABIN PRESSURE CONTROLLER AND INSTALLED REPAIRED UNIT. COMPLIED WITH MANUAL CABIN PRESSURE CONTROL SYSTEM OPS CHECK AND BAGGAGE COMPT. ISOLATION SYSTEM FUNCTIONAL CHECK REF MM 21-30-00 WITH NO FAULTS FOUND. REPACKED O2 MASK'S AS REQUIRED.