As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)CREW NOTED ELECTRICAL BURNING SMELL IN FLIGHT COMPARTMENT AND CABIN. CABIN PRESSURE CONTROLLER FOUND SHORTED INTERNALLY, PRODUCING THE SMELL. THE ZENER DIODE VR3 ON THE POWER CIRCUIT BOARD HAD OVERHEA TED AND BURNT THE CIRCUIT BOARD AND CLEAR BLACK COAT EMITTING INTENSE "BURNT PLASTIC" ODOUR.