[BiturboS4] common leak question

[Richard Ness]

When the (common I guess) washer system leak does finally
happen, what turns out to be the defective part?

Mine now is leaking from what looks like a pump assy. that
is on the front of the fluid reservoir. Is there a seal that fails,
or is it the stupid pump and replacing is the only fix?
It leaks profusely and the warning indicator is becoming
quite irritating.

It also looks like a bitch to get at to fix. Procedure anyone?