As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER COMPLETING CROSS BLEED START NOTICED BOTH OVERHEAD "ALTN" LIGHTS ILLUMINATED. ACFT GROUNDED. FOUND ELECTRONIC ENGINE CONTROL SWITCHES OUT, RETURNED ELECTRONIC ENGINE CONTROL SWITCHES BACK TO ON. RAN ENGINES, WORK NORMAL. NO OVERHEAD "ALTN " LIGHTS ILLUMINATED.