My 2000 Grand Banks 42C has Naiad stabilizers - installed new by Stabilized Marine in Ft. Lauderdale. 954-797-7330. I highly recommend them if you're anywhere within reason. I have them come to Ft. Myers (usually set it up when they have other nearby calls & split the travel). Either way, they are definitely worth talking to about your situation. They know their stuff and can be creative with problem solving (not just parts replacers).
The PO postponed routine maintenance and it got costly. Seals totally gone, shafts pitted, etc. His repair bill was close to 13K! I am a preventive maintenance kind of guy and I had Stabilized do a routine seal job at my last haulout (River Forest Yachting Center - LaBelle location). A tad over 1200.00 total. That was 2 years ago and I plan to have boat pulled, bottom paint & stabilizers serviced by both companies again early next year.
IMO, if you're seeing water weeping in around the shaft(s), then the seals might be gone. I'd be looking to service them sooner than later.