Doesn't ring any bells with me either. It's while back since I operated the 744 but as I recall it there could be serious (?) structural issues with the wing LE if the LE flaps were retracted on the ground and the WAI was running, so
AFAIK it was no despatch if stuck open, and bleeds off on the effected side ASAP after landing if a valve stuck open in the air.
Don't remember anything about Vref additives.