Thanks guys. Yesterday I spoke with an electrician (co-worker) about gfci testing. He suggested that the older gfci's may and do fail to operate correctly even if the test button works. The newer ones don't fail with age. Older styles have to be exersized monthly or the contacts weld together.
Also different testers do have different mA leakage which is why some gfci;s will not trip on an external test.
His advise, throw it away, better safe than sorry.
On a totally different note: K_buz, you mentioned on another thread about cordless vs corded drills and using extention cords "that they come in different lengths" I am being polite by posting this here. You missed the obvious, "they also come in different colors" HA, HA