Update - I received two PIA's from Jameco a few weeks ago. Put them in my Wild Fyre and that fixed the problems I was having.
Then I ordered a PIA tester from Neoloch. I tested the 7 questionable PIAs I had in my parts drawer - 5 were good and 2 bad.
Today I received the 10 PIA's from China. 9 tested good - 1 bad. Better than I expected. Not bad for 10.00. But they seem to be all different markings? And some look like they been scuffed up and dirty.
The Neoloch tester is going to be an invaluable tool.
In my parts drawer I found 2 IC's marked SC44067P. I checked on line and found they seem to be a replacement for the 6821. They checked good in my tester. Anyone ever heard of this? Will they work in a pinball?