Isolate
Hello Bob: Prove trouble by removing cable at tranny and shifting manually. I always advocate DIY (yours may be a special case, routing, access, tools etc.) as you will learn your boat, which might come handy sometime. Case in point, just got back from a week at Charlotte. Not much wind, lots of motoring. Waterpump spun impeller. Pulled out of channel, anchored, changed impeller and back in business in 45 min. Think what the outcome would be if I couldn't DIY. Good luck red