Hehe, that's what happened to my first clutch Kully. The spring managed to find it's way somewhere unhelpful and it wouldn't de-clutch. I thought the slave cylinder had gone when it happened. I was never one for pratting around wheelspinning but that's when I learned that the V6 clutch and drivetrain isn't even up to what normal people would call "spirited driving". I was never confident in the car after my fairly sympathetic driving knackered the clutch.
So is the gearbox still suspect or do you think the clutch was the problem? I never did hear exactly what the symptoms were.
Best of luck, and best wishes to Tony and Mark!