What was found
ENG 1, FUEL FILTER, LEVEL 1 ALERT INFLIGHT, FL 340, RECEIVED FUEL CONTAMINATION LEVEL 1 ALERT. THEN FUEL FILTER ENG 2 LEVEL 1. CHECKED AND REPLACED ALL 3 ENG FUEL FILTERS AND APU FILTER, FOUND CONTAMINATION. MILKY AND TOILET PAPER LIKE SUBSTANCE. SUMPED 1 AND 3 TANKS AND FOUND SIMILAR CONTAMINATION. UNABLE TO SUMP FUEL OUT OF NR 2 TANK. CONTACTED MOCC WITH UPDATE. CONTACTED LOCAL VENDORS FOR DEFUELING AND WAS TOLD THAT THEY WOULD NOT. ALL CONTAMINATION CLEANED IN ALL TANKS BY FCC VENDOR IAW WO 5110376. ACFT OK FOR SERVICE. FINAL CLOSED.