What was found
SHIP 1814 -RVSM- ALT DISAGREE AT FL330 RIGHT ALTIMETER 250 FEET HIGHER THAN LEFT AND CENTER ,RAN QRH AND SELECTED CO-PILOT AIR DATA TO "L". OUT OF TOLERANCE FOR 5 HOURS, LAST 1HR OF FLIGHT WAS WITHIN 50 FEET OF EACH OTHER. CORRECTIVE ACTION: R/R RIGHT AOA REF B767-400 AMM 34-26. OPS CKS NORMAL. C/W PITOT-STATIC LEAK CKS PER B767-400 AMM 34-11. NO DISCREPENCIES NOTED. PRESSURIZED PITOT-STATIC SYS REF B767-400 AMM 34-11. (5045979)