What was found
DIVERTED, AT CRUISE CAB PR1 FAULT WHEN LEVELED AT 36,000. AC THEN DISPLAYED EXCESSIVE CABIN ALT, ALL SECONDARY INDICATIONS WERE NORMAL CABIN ALT WAS 6400 NO EXCESSIVE RAE AND NORMAL DELTA P. R & R OUTFLOW VALVE ASSY IAW AMM 21-31-51. OPS CHECK NORMAL ALSO PRESSURIZED THE AC IAW AMM 05-50-00. ALSO, OPS CHECK NORMAL VISUALLY INSPECTED SAFETY VALVE FOUND TO BE FULLY SEATED.