The Editor has softproof functionality built in. As part of the Editor softproof it is possible to apply a TAC overlay to highlight overinking areas. The overinking areas are highlighted by a greenish overlay.
The TAC overlay is found in the Output Palette (Windows menu -> Output):
You can select the TAC to the desired value and check the artwork to find the overinking areas. For example, with a TAC at 280%:
Reducing the TAC to 180% adds a green overlay:
Note: These are reference space TAC values, not the printer (PMM) space.