RL02 problem

Hi, last week, my PDP11/23+ was rebuilt into a new chassis (went from OEM 19" box to a proper 11/23+ chassis), and after the rebuild failed to work :( My first suspect was the new chassis, so it went back into the old box - still no boot. After trying each of the RL02s in turn, and even a different controller, I still couldn't get the machine to boot. After a little head scratching, I tried an alternate disk pack (still RT11), and the machine booted. After rebuilding the machine back into its new box, it all worked. A little more investigation shows that I can still read the faulty pack (installed in the second drive), but that the boot information is either corrupt or gone. Now for the question: can I restore the boot information, or will I have to re-initialise the pack and start again? (not a problem - it was my games pack with the extended monitor, but I can restore it from a backup, if needed). I will take all of the comments of "idiot" with good grace....... Thanks Jim. Please see our website: www.g1jbg.co.uk