What was found
WHILE TAXIING IN, DURING APU START-UP, OILY FUEL FUMES ARE NOTICEABLE THROUGHOUT THE ENTIRE CABIN AND COCKPIT. SMELL DISSIPATES A MINUTE OR TWO AFTER APU RUNNING. C/W NO GO ODI CHECK STEPS 1 THRU 5 PER STEP 6 REMOVED L/H AND R/H BUFFER VALVES, R/H SHOWS NO OBVIOUS DAMAGE OR BLOCKAGE, SUSPECT L/H HAS LEAK. REF 717 AMM 75-22-01-000-801. REINST. NUM 2 ENG BUFFER VLV. AND INST. NEW BUFFER VLV. ON NUM 1 ENG PER B717 AMM 75-22. NO GO ODI PREVENTION COMPLETED. APU DEFERRAL ON LP 5081052. VERIFICATION FLT. ON LP 5081054. (LP5081050)