"TASK 74-00-00-740-801-N00
2. Ignition System - Operational Test
A. General
(1) This test makes sure the igniter and exciter operate correctly, and that there is aircraft electrical power to the ignition system. The test makes sure that the igniter relays in the engine relay unit (ERU), the igniter relay wires between the EEC and ERU, and the ignition voltage feedback circuits are OK.
As it seems that you've run this test and it always works OK, and you've replaced the major components for the system, perhaps the fault lays in the AIMS cabinet card that drives the message. Might I suggest you consider I/O card M008 LH Engine ( M009 RH Engine) in the AIMS cabinet. If you do change these cards, I'd double check the part number and software state to ensure they're compatible with the AIMS blockpoint software load.