As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, AFTER APPROX 3HR OF FLIGHT F/OS ALTIMETER CLIMBED BETWEEN 160' TO 180' SHOWED 37180 SWITCHED TO ALT AIR DATA ALTIMETER INDICATED GOOD AT 37020. TROUBLESHOT F/O ALTIMETER PER FIM 34-12-0. NO FAULTS ON EITHER ADC, CHECK PITOT STATIC SYSTEM PER FIM 34-11-00/101. ALL CHECKS OK FOR SERVICE.