The government's MOT history website will tell you if your car is due any updates.......but unfortunately the ABS pump and controller are one unit.
The problem is they die with age, mechanically, because the ABS pump is seldom cycled during a brake fluid flush, which is the proper VAG procedure. Only dealers do this. DIY and back street garage flushes don't do it.
If the ABS pump is not exercised during a fluid flush, the cruddy old dirty fluid doesn't get pushed out of the pump pistons, which eventually leads to seizure.
It's a good excuse to upgrade to a MK6 XDS ABS upgrade though. Traction control up to 60mph (instead of the MK5's pathetically low 25mph or whatever it is) and also proper spinning wheel braking, aka 'electronic diff', traction control instead of the MK5's one tyre fire action.