i have heard of a few ways, but the problem with them tends to be under load (AFAIK) which is next to impossible to simulate.
the solution when i had trouble with mine went as follows.
1. Remove 1st group, install new one, drive.
2. if step 1 doesnt remove miss, move to group 2 and repeat step 1.
pretty annoying but it worked in the end.
if you are trying to test some that you are not sure are working on the other hand could be slightly more difficult.
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