What was found
AT TAKEOFF, RECEIVED ECAM MESSAGE FOR NR 1 ENG FUEL FILTER CLOGGED, REJECTED TAKEOFF AT 60 KTS, MESSAGE DISAPPEARED AFTER A FEW SECONDS. MADE SEVERAL ATTEMPTS TO TRY & DUPLICATE MESSAGE WITH NO SUCCESS, TAXIED BACK TO RUNWAY & TOOK OFF. AFTER TAKEOFF AT APPROX 1000 FT, NR 1 ENG FUEL FILTER CLOG MESSAGE REAPPEARED & STAYED ON FOR APPROX 5 MINS THEN DISAPPEARED FOR REMAINDER OF FLT. WHEN ACRFT LANDED, MX REPLACED NR 1 ENG FUEL FILTER ELEMENT, LEAK CHK GOOD.MX R/R NR 1 ENGINE FUEL DIFFERENTIAL PRESSURE SWITCH IAW AMM, LEAK & OPS CHECK GOOD. FUNCTIONAL TEST OF FUEL DIFFERENTIAL PRESSURE SWITCH S/N N101 COULD NOT DUPLICATE REASON FOR REMOVAL, UNIT PASSED ALL TESTS PER CMM 73-34-15, REV. 2.