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Is it possible mounting a 9.9HP kicker on the port side may have something to do with the boat listing to port? Before going to the trouble and expense of hauling the boat to investigate for leaks I would consider removing the kicker from the transom and observe the result.

If the kicker fuel is supplied from an on deck auxiliary fuel tank I would try to find a way to place the tank midships.

For peace of mind the owner may want to inspect the hull underwater. This can be done wearing a snorkel and mask. It can be dangerous to be in the water at a marina. A better place to do it could be when the boat is anchored in shallow water or beached.

If the boat has twin fuel tanks the list could be caused by improper fuel management, ie. using fuel from the starboard tank until it is almost empty before switching to the port tank.