As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AFTER DEPARTING JFK WE GOT A FAULT RELATED TO ADR 2. AFTER TROUBLE SHOOTING, AND NOT SURE EXACTLY WHAT WAS THE UNDERLYING ISSUEWE DIVERTED TO PIT. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED #2 ADIRU IAW AMM 34-12-34.