As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE POWERING UP THE AIRCRAFT AT THE GATE FOR THE FIRST FLIGHT OF THE DAY, AN ACRID SMELL WAS DETECTED. THE AIRCRAFT WAS DEPOWERED. THE GPWS CIRCUIT BREAKER ON THE 115 VAC BUS WAS FOUND TRIPPED. THE CAUSE OF THE SMELL WS DETERMINED TO BE COMING FROM THE INTERNALS OF THE GPWS COMPUTER. THE COMPUTER WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE. TIME SINCE REPAIR 4376 HOURS.