As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2348: NR 2 AC GEN WOULD NOT COME ON LINE AFTER START. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE PERFORMED RETRIEVAL OF DATA FROM EPCU. FOUND CODE 28 2AC GCU. REMOVED AND INSTALLED SERVICEABLE NR 2 AC GEN GCU IAW Q400 AMM 24-21-06-000-801 AND 24-21-06-400-801. PERFORMED OPS TEST IAW Q400 AMM 24-21-00-710-801. OPS TEST GOOD. NR 2 AC GEN COMES ON LINE AS REQUIRED. AIRCRAFT RETURNED TO SERVICE.