What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO SAT DUE TO THE FLIGHT CREW REPORTING THAT THEY BRIEFLY SMELLED BURNING RUBBER PRIOR TO TAKE OFF BUT WENT AWAY QUICKLY AFTER WE EXITED THE RUNWAY. AFTER TAKE OFF APPROXIMATELY 1,000', FLIGHT ATTENDANT CALLED TO STATE THE AFT FLIGHT ATTENDANTS ARE REPORTING BURNING ODOR IN CABIN. THE AIRCRAFT LANDED SAFELY AT SAT WIOTHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED SMOKE / ODOR / FUME TROUBLESHOOTING TASK CARD 6L00021001 AND FOUND NO NOTICEABLE ODOR. AND NO SPECIFIC PART WAS IDENTIIFED THAT WOULD HAVE CAUSED THE ODOR.