I sent a 2017 Rockshox Monarch RT to a suspension shop for a 200 hour service. I got a call from them today saying the internal shaft was scored or bent or something and that Rockshox no longer supplies this part so my only option is to trash the shock and buy a new one. I've only had two rear shocks and I can't say for sure I would know what a blown damper feels like but the shock seemed to be working okay to me. I only sent it in because the service was due. I'm skeptical that the shop maybe damaged the part during disassembly. I guess there is no way I will ever know but I thought someone on here might be able to tell me if the internal shaft is impossible to source or not. I wasn't really planning on dropping $500+ on a new shock but I can't ride without one. Any advice?