Does anyone know or can point to an a official source on how to run a repair when both SP1 and SP2 are installed. Should they be uninstalled first then repair the RTMZ? Can they be left the way the are and install the RTM? Do they need to be reinstalled after I run the repair function on the original FSX disc? Thanks for your help.

I think all you would have to do is run the repair and then install sp1 and then sp2.Now after that you might have to re-install some of your add-ons.