What was found
NR 2 ENGINE FILTER BYPASS LIGHT ON DURING TAXI, AFTER LANDING. ACFT GROUNDED. REPLACED THE NR 2 ENGINE EEC IAW AMM 73-21-60-00-801-F00, & 73-21-60-400-801. FUEL BYPASS STILL ON AND OFF PRIOR TO STARTING. PERFORMED INDENT/CONFIG IAW 73-21-00-700-808-F00, TEST 12 ACTUATORS TEST IAW AMM 71-00-00-700-807-F00, EEC DISCRETES TEST IAW AMM 73-21-00-700-809-F00. THESE TESTS PASS PERFORMED EEC TEST IAW AMM 73-21-00-700-804-F00, TEST DID NOT PASS. MESSAGE 73-31072 IS STILL PRESENT. NR 2 ENGINE INPUT MONITORING OF FUEL FILTER SHOWS ALL FOUR CHANNELS OPEN. RANG OUT FUEL FILTER DIFFERENTIAL PRESSURE SWITCH, S241, FOUND NO CONTINUITY BETWEEN PINS 1 AND 2 IAW WDM 73-31-11. REMOVED AND REPLACED FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01/401. ALTERNATE DEACTIVATION PROCEDURES REVERSED. OPS AND LEAK CHECKED GOOD.