As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELLED ELECTRICAL SMOKE, SAW SPARKS FROM APU/ENGINE START PANEL, APPEARED TO BE START AND CONTINUOUS (A) CENTRAL C/B AND ALL IGNITION (A) AND CONTINUOUS IGNITION (A) 2 AND 3, PULLED C/B`S SPARKS STOPPED. PULLED CONTINUOUS IGNITION (A) 1 AND 4 C/BS. REMOVED AND REPLACED CIRCUIT BREAKERS E27 (L SCREEN HEAT (A)) AND E29 (MANUAL TEMP CONTROL). REMOVED AND REPLACED WIRES 133C AND FE44. GENERATED ADDITIONAL WORK CARDS IN WORK ORDER 52491 FOR OPS CHECKS.