As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELL OF BURNING RUBBER SMELLED IN THE CABIN WHEN ACFT IS SET TO TAKEOFF POWER. MOST NOTABILY DURING THE FIRST TAKEOFF OF THE DAY. RAN AIRCRAFT WHEN IT FIRST CAME IN (12/30/05) NO SMELL NOTICED. RAN AGAIN FIRST THING THE NEXT DAY (12/31/05) NO SMELL NOTICED IAW MFG CH 21-00-00 AND STANDARD SHOP PRACTICES.