I gave a quick check at NCBI and I couldn't find any article on qPCR using bone marrow samples. I believe you will have to assay different HKG to check which one is the best for your conditions (health vs fibrosis). Since you are using RT2 Profiler, I know that Qiagen also has a predesigned plate with 12 different endogenous control. That can help you choose the best control.