As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START WHEN POWER WAS TRANSFERRED TO AIRCRAFT POWER AN ACRID SMELL WAS NOTICED IN COCKPIT. SPARKS WERE SEEN COMING FORM FIRE DETECTION PANEL BEHIND P6 PANEL. REPLACED CARD INDEX PANEL PER M/M 26-11-05 AND OPERATIONAL CHECKED PER M/M 26-11-00.