As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO TAKEOFF FROM HOSPITAL HELIPAD, THE PILOT INSTRUMENTS LIGHTS WENT DARK. SOON AFTERWARDS THERE WAS THE ODOR OF BURNING INSULATION IN THE COCKPIT. AC SHUTDOWN, DISCUSSION WITH THE MAINT TECH CONCLUDED A SUSPECTED PILOT INSTRUMENT POWER SUPPLY FAILURE. AC WAS PLACED ON MEL STATUS AND RETURNED TO HOME BASE FOR INSPECTION. THE SUSPECTED PART WAS REMOVED AND INDEED HAD THE ODOR OF BURNED INSULATION. (K)