As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL (LIKE BURNED INSULATION). SMELLED IN FWD CARGO COMPARTMENT ON GROUND. SMELL WENT AWAY AFTER POWER REMOVED FROM ACFT. INSPECTED AVIONICS COMPARTMENT AND GROUND RAN ACFT IAW JIC 72-00-00, NO SMELL NOTED. REF ITEM NR 2 THIS LOG PAGE, FOUND RADIO ALTIMETER EXTREMELY HOT. R & R RADIO ALTIMETER IAW JIC 34-42-81. VISUALLY CHECKED CONNECTIONS IN AVIONICS COMPARTMENT, NO DEFECTS NOTED.