What was found
UNWANTED TRANSFER LEFT TO CENTER TANK. ACCOMPLISHED FUEL SCAVENGE SYSTEM TEST. TEST FAILS FOR LEFT FUEL SCAVENGE SYSTEM. DID NOT INCREASE. OPENING LT CNTR TANK TO INSPECT PLUMBING FOR SOURCE OF XFER. ACCOMPLISHED CENTER TANK DISCHARGE CHECK VALUE FUNCTIONAL TEST. NO UNWANTED TRANSFER FROM LT OR RT INTO CENTER TANK. REMOVED AND REPLACED LH MAIN OUTLET SCAVENGE SYS SHUT-OFF VALVE. RUN LEAK CK, OP'S CK GOOD. PRESS CK OK. NO LEAKS FOUND.