The boat stayed in the driveway for a few months while I inspected both hulls and mulled over what to do about it. The starboard hull felt and appeared fine. The port hull had a soft spot amidships underneath the trampoline just aft of the front crossbar. Apparently, this was the source of the gradual water leak, no other chips or damage to the fiberglass was noted. Ultimately, I decided to sell the Hobie to my brother, who turned it over to his son to sail.
I bought the boat, intending to simply replace the hull and have a functioning boat. Then, I got the idea to pull both hulls off, cut them into segments and trace out some molds to rebuild the hulls from strips of cedar, like I did with the canoe discussed here. The plan is to get the project started this spring, so stay tuned for progress posts. :)