What was found
DURING TAKE OFF, RT PACK OFF AND RT ENGINE BLEED OFF LIGHTS ILLUMINTAED WITH PACK SELECTED TO AUTO. DUCT PRESSURE GAUGE READS 5-10 PSI ON RIGHT. AIRCRAFT DIVERTED, AIRCRAFT WAS GROUNDED. CONDUCTED T/S, PER B767 FIM 36-20 FT 805, RT PRSOV FAULT INDICATED. REMOVED OLD, THEN INSTALLED NEW RT PRSOV, IAW AMM 36-11-09, TEST OK. RIGHT ENGINE RUN CONDUCTED, PER ERU AND TAXI CHECKLIST, DUCT PRESSURE RIGHT SIDE 40 PSI, BLEED SHIFT OK. RIGHT PACK OFF CAUSED BY NO DUCT PRESSURE. AIRCRAFT RELEASED.