Well, I managed to prise the side panels off the ABS ECU. I assume the solder joints that crack are between the connector block and the PCB. If so mine look fine.
Performing the ABS fault diagnosis by the manual (Ch 70, p.17), the Main Relay was shown to be faulty (1.5M ohms instead of 100 ohms) but I can't find it! Well, at least I'm not sure if I have or not.
The manual says (in Electrical Harnesses, Ch 90, p.48) Main Relay (RS97, natural base) is by the RH Blower Motor (apparently under the drivers dash), and the ABS ECU Relay (RS103, blue base) and the ABS Pump Relay (RS96, yellow base) is in the Drivers Footwell. Looking at the picture you can see there are blue, yellow and natural bases but the wire colours to the natural base doesn't seem to match the wiring diagram.
Can anyone tell me if this is the ABS Main Relay?