Transom replacement on I/O

[dginge]

Hello again
Can someone tell me your thoughts please. I'm curious more so than anything.
My transom was replaced with Bluewater Coosa board in 2013 by Embree Marine in St Petersburg FL by previous owner. It's a single I/O. They billed for 32 hours of transom work. So with an I\O rebuild do most people take it all the way out to the port and starboard sides or just do a 4x4 or so foot section around the rotten outdrive (in the notes that was described as the area that was rotten)? . I notice on the storage box drain tube has some wetness so I'm assuming that they Didn't take it all the way out since its not load bearing over there with a bracket or a twin outboard setup. What do most people do when replacing an I/O boat? Thanks so much for your feedback. Cheers