As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKE OFF APPROX 5000FT BOTH CAPTAIN AND FIRST OFFICER PFD GOT PITCH AMBER FLAG AND THEN ROLL FLAG, AND SCRATCH PAD MESSAGE THE IRS DISAGREE FOLLOWED BY LEFT IRS FAULT LIGHT. CAPTAINS PFD WAS UNRELIABLE. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT BNA. REMOVED AND REPLACED LEFT ADIRU, PER AMM 34-21-01. OPERATIONAL CHECK GOOD. FAULTS CLEARED.