As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF ALL CABIN PRESSURIZATION CONTROL @ FL 360 MX PAGE SHOWED AUTO 1/AUTO2 INOP. HI FLOW /EICAS SHOWED CABIN ALT MASTER WARNING CABIN AUTO INOP MASTER CAUTION. CREW ELECTED TO AIR TURNBACK TO DEN, MAINTENANCE GROUNDED AIRCRAFT. MAINYENANCE T/S PER 767FIM 21-31 TASK 801-802. FOUND R/H FLOW CONTROL/SHUTOFF VALVE (V17 ) FAULTY. REPLACED FLOW CONTROL SHUTOFF VALVE R/H,(V17) PER AMM 21-51-01. OPS CHECKED WITH MANUAL MODE CONTROL TEST PER AMM 21-31-00. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.,