As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMEROUS PUSH BUTTON ANNUNCIATORS (PBA'S) WILL NOT LAMP TEST ON OVERHEAD PANEL. CONFIRMED DISCREPANCY, FOUND TO BE A DEFECTIVE BRIGHT/DIM POWER SUPPLY. REMOVED AND REPLACED DEFECTIVE UNIT. UNIT HAS A BURNING ELECTRICAL SMELL TO IT THAT WAS NOTICEABLE IN THE COCKPIT.