As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING WITH APU RUNNING AND POWER ON RT ENG ON APU GEN, SHUT DOWN RT ENG AND APU GEN IMMEDIATELY DROPPED OFF LINE. RECONNECTED APU GEN TO RT SIDE SIMULTANEOUSLY. F/A IN AFT NOTED SPARKS IN CEILING. CRACK IN CEILING ON CAPT SIDE WHERE AISLE MEETS GALLEY WALL. ALSO NOTICED ELECTRICAL BURNING SMELL WHICH DISSIPATED QUICKLY. SPARKS LASTED ONLY AN INSTANT. NO C/B POPPED. FOUND APU GEN FEEDER CABLES ARC''D IN CEILING FWD OF AFT GALLEY.