3. Use a long flat-blade screwdriver to disengage the engine control unit (ECU) shield retainer hooks (left hook shown; callout 2) inside the device. Push the hooks into the device to disengage them. Figure 6-57 Remove the ECU (2 of 6) 4. Disconnect one FFC (callout 3) from the formatter. Figure 6-58 Remove the ECU (3 of 6) ENWW Removal and replacement strategy 99