What was found
DURING CLIMB CREW REPORTED AN ELECTRICAL EMERGENCY ABNORMAL EICAS MESSAGE ABOUT 1 SECOND AFTER TURNING APU OFF AS PER CLIMB-OUT PROCEDURE. AIRCRAFT WAS RETURNED TO FIELD. THE CREW RESTARTED THE APU AND REESTABLISHED ELECTRICAL POWER TO THE AIRCRAFT. MAINTENANCE REMOVED AND REPLACED RELAYS K0018 AND K0019 (P/N M83536/19-008L AND M83536/19-008L) IAW WITH EMB MM. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)