As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C HAD NUMEROUS FAULTS AND WARNINGS AND THE CREW DECLARED AN EMERGENCY. AFTER EMERGENCY DECLARED THE CREW FOUND THE DC STBY C/B POPPED ON THE P-6 PANEL DOWN BY THE FLOOR. RESET THE C/B AND ALL SYSTEMS NORMAL. MTC DID A FUNCTIONAL CHECK OF THE STBY POWER SYSTEM. ALL SYSTEM CHECK OK.