As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA/SJU - FLT 501 - AFTER DEPARTING MIA EN ROUTE TO SJU, CAPTAIN'S ADI ROLLED OVER. AIRCRAFT RETURNED TO MIA. FOUND NR 1 ADI AND INSTRUMENT RACK AT FAULT. REMOVED AND REPLACED NR 1 ADI AND NR 1 INSTRUMENT AMP RACK. OPS NORMAL IAW 34-23-0. REFERENCE: OPERATOR CONTROL NR 95ZZZX5918. (X)