pdp11/83 rsx11m+ system, lots of questions!

Hi all, it's time for me to get to grips with this 11/83 system I got many years ago. It has a fuji 2246E ESDI HDD hung off an emulex QD21 MSCP controller. The hard drive is starting to show its age and is making worrying clunk noises & spin down-up restarts occasionally (have to say that the ESDI disks had appeared far more reliable than the RD5x drives in my BA123 MicroVAX-II system, both of which are now bricks) How easy are replacement ESDI disks to come by? I think I should image the RSX11M+ system that is on the 11/83 disk (I restored it from some magtape backups some years ago from an 11/93 system I was using then but I have no working 9track drives around any more :( I either need to re-learn MACRO-11 and RSX11M+ programming skills (online manuals anywhere?) or have some kind person throw me some code to upline dump every sector from the disk... Would be nice if I could then use this image under an emulator! I know that this RSX11M+ sysgen didn't include support for TK50 tapes, alas, else I could put a M7546 controller in and do an image dump (if I could remember how to drive BRU that is). And I don't have the 11M+ install tapes any more. Unless there is a way to re sysgen support for MU (I think that's TK50 device name?) on the installed system? sorry to ramble on :) thanks for any help, greg