As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - AT FL 320, F/O ALTIMETER READS 160 FT LOWER THAN CAPT AT FL 250 IT READS 230 FT LOWER THAN CAPT. NO FAULTS NOTED ON BOTH NR 1 & NR 2 ADC. PURGED NR 2 PITOT/STATIC SYS. LEAK CHECK OK. REPLACED NR 2 AOA SENSOR. OPS CHECK OK PER MM 34-12-03-404-013.