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Welcome to the Forum and congrats on your new '91 Vette...
For testing, you might try swapping the power window sw with the power door lock sw as they are the same unit.
Is that still the case after the interior change? I could see that on the pre-89 cars, but I thought the connections were different? It has been a while since I had an early door apart. I am pretty sure my current '93 has different connections for the window and door lock.