As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING RUBBER SMELL IN COCKPIT WHILE ON GROUND. WITH DOOR OPEN, APU RUNNING AND BOTH PACKS RUNNING FACT 09NOV24 11:56 CLT UPON FURTHER INSP FOUND BTC K0081 & SBC K0085 OVER-HEATING. R/R'D BTC K0081 IAW AMM 24-60-01 & R/R'D SBC K0085 IAW AMM 24-60-02. OPS CHECK GOOD. NO BURNING SMELL NOTED. AIRCRAFT OK FOR SERVICE AT THIS TIME.