As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT JB463 BOS-RSW CREW PERFORMED AIRTURN BACK TO BOS DUE TO "AC BUS 1" FAULT ON TAKEOFF AND LANDED UNEVENTFULLY. BOS MX REMOVED AND REPLACED TRU NR 1 IAW AMM 24-32-51. REMOVED AND REPLACED TR 1 CONTACTOR IAW AMM 24-32-55. REMOVED AND REPLACED TR 1 SPLY C/B IAW TSM 24-30-00. ALL OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.