As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTIPLE STATUS MESSAGES DURING TAXI IN. (I.E., MAIN BAT CHG FWD AND AFT DET FAN 1A AND AB, FWD AND AFT CARGO DET AIR) HYD QTY WENT TO 0.03RF ALL THREE RESERVOIRS. WHILE AT THE GATE, MTC FOUND GRD SERVICE BUSS C/B POPPED. RESET SAME AND NOTICED ARCING COMING FROM K105 AND K120 RELAYS IN THE P32 R GEN PWR PANEL IN LOWER E/E COMPT. REPLACED RELAYS AND BPCU.