Most of the rot has been exposed. A 230V line to the hot tub and a unused gas line (formerly for a propane grill) were in the way of tearing back further but were later removed. About 8-10' of material had to be removed exposing the joists. There was some slightly spongy subfloor in the MBR but that can wait until the floor is replaced at some time in the future. A poorly installed doggie door was part of the problem and has since been removed.