As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ROWS 4 AND 20 AND 21, THERE WAS A BURNING ODOR OF ELECTRIC WIRE BUT NO SMOKE. PERFORMED TASK 05-51-26-800-801 C1 NO TROUBLE FOUND PERFORMED HIGH POWER RUN ON BOTH ENGINES NO PROBLEM FOUND OPERATION OF BOTH PACKS AT VARIOUS TEMPS CHECKS NORMAL. R & R BOTH RECIRCULATION FAN FILTERS IAW AMM 21-25-01-000-801, OK TO CONTINUE.