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Was it working before the recap? The left mouse button is pretty straightforward and is handled by the U7 CIA. Check the voltage on pin 6 of the port (should be close to 5V when the button is not pressed, 0V when it is). Use a multimeter to check the relevant traces between the port and the CIA.
Just for clarity, there are no electrolytic capacitors directly involved in the left mouse button operation.
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