Thanks robdelorenzo.
I will definately try to tackle the pressure test-I'm intimidated by auto-projects that have more than about 10 steps but the pressure test sounds like something I might be able to brag about having done myself
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I am trying not to be too optomistic-at this point-about the dry spot under my car in case I start seeing evidence of leakage again.
To give an idea of how significant the leaking was-this is what I'd find each day at 5pm. My officeparking spot is on a slight incline which I guess was allowing the liquid to drain from the under-carriage cover...