As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN APU BLEED WAS TURNED ON, A BURNING ODOR AND CABIN BECAME HAZY. TROUBLESHOT THE APU BLEED AND FOUND AN APU OIL COOLER TRANSFER LINES LEAKING. REPLACED OIL COOLER TRANSFER LINES IAW SB 49-1113 AND AMM 49-91-44-420-056-A. PERFORMED A SATISFACTORY LEAK CHECK IAW AMM 49-91-44-420-056-A. PERFORMED A SATISFACTORY APU DECONTAMINATION IAW AMM 21-00-00-615-002-A. NO CONTAMINATION NOTED. AIRCRAFT RETUNED TO SERVICE.