As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND ELECTRICAL SYS FOR MEDICAL UNIT WAS MISSING A GROUND AND WAS DISSIPATING THROUGH CONTACT WITH FLOOR TRACK. MEDICAL CREW NOTICED SMOKE AT FLOOR UNDER UNIT DURING ENGINE START SEQUENCE. EVACUATED MEDICAL CREW AND DISCHARGED PORTABLE FIRE BOTTLE AT SOURCE. SECURED SYS. GROUND CORRECTED AND VOLTAGE DISSIPATION THROUGH FLOOR TRACK ELIMINATED. OXYGEN LINE REPLACED AND REROUTED WITH CHAFE PROTECTION.