As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#835, BOS-MSP. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' 36 R BLEED FAIL IN CLIMBING THENFL330. R PASS REG SOV INOP COMPLIED WITH ECL- DESCENT 300; THE OMS RECORDED R ENG PRSOV AS THE POSSIBLE CAUSE. REMOVED AND REPLACED R ENG PROV PER AMP 36-11-01. OPS CHECK W/ENG RUN IS STILL REQUIRED. SEE L/P 3764547 ITEM,1 (OPS CHECK OF R ENG BLEED PRSOV WAS SUCCESSFUL. A/C OK AT THIS TIME).