As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, RECEIVED AN AC ESSENTIAL CAUTION MESSAGE INTERMITTENT RAN QRH AND SWITCHED TO AC ESSTENTIAL TRANSFER, IT MADE NO DIFFERENCE-RETURNED TO DEPARTURE. ACFT RETURNED TO DEPARTURE AFTER TAKE OFF. EMERGENCY DECLARED. R & R ESSTENTIAL BUSS RELAY. OPS CHECK TEST GOOD IAW AMM 24-51-27. IPC 24-01-06 ITEM 55A.