have 2006 90 hp mercury 4 stroke efi while getting ready to put away for winter noticed one bolt broken off power trim anode I removed other bolt and removed anode it is very corroded bolt is broken off flush with plate looks as if you would have to remove motor to be able to try and drill and tap not really set up to remove engine dealer is ...I will not go there out of the question would one bolt be enough?also looks like ground wire was on broken bolt it goes from top of power trim to this bolt I believe could this have been issue with trim gauge not working?