As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: CABIN AIR COMPRESSOR R1 WHITE STATUS LIGHT COME ON AT 0535Z FL390. SMELT PAPER BURNING ODOR FOR 2 SECONDS IN FLIGHT DECK AT THE SAME TIME AS STATUS MESSAGE. COMPLETED INSTALLATION OF CABIN AIR COMPRESSOR R1 IAW AMM 21-51-19.