As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FINAL APPROACH, CLEAN CONFIG. FA REPORTED BURNING RUBBER SMELL INTERMITTNETLY NEAR ROW 25.-PERFORMED TSM 05-50-810-831-A REMOVED ALL PSU PANELS AROUND SUSPECTED FUME AREA AND FOUND NO ELECTRICAL OR FUME ISSUES. ALSO RAN ENG 1+2 ISOLATING ENG BLEED AND PACK SYS 1+2. APU AND APU BLEED WAS ALSO RAN SEPARATELY. COULD NOT DUPLICATE ANY ODOR INSIDE THE A/C NO DEFECTS NOTED. A/C OK FOR CONT. SVC.