The last time i repaired the TR6 frame, i just focused on the repair in the front and cleaning up what i could reach. I could see some small holes on the trailing arm mount tubes, but the frame generally looked solid enough to not worry about it.
While getting ready for the Waumandee Time Trial (hill climb), i put the car up on a lift (thanks, Brandon) to do some maintenance and give everything a once-over. Those little holes in the frame had gotten noticeably larger.