As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL-ROC - FLT 275 - DURING CLIMB-OUT, THE CREW NOTICED NUMEROUS 'CLICKS' INDICATING RELAYS CYCLING. IMMEDIATELY THEREAFTER THE ANNUNCIATOR PANEL INDICATED NUMEROUS SYSTEM FAILURES FOLLOWED SHORTLY BY CABIN PRESSURE WARNING. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE AC BUSS CONTROL PANEL AND THE LEFT AUXILIARY POWER RELAY. (M)