Get it fixed at Krell. You should be able to get the upgrade for free if the unit is still under warranty. Then sell it on AgoN and get their new player, which retails for $2500. The new player sounds better, has digital inputs and uses reliable Esoteric drive.
The SACD Standard is the model to forget. It was doomed the day they opted for unreliable Philips drive (ofc, they did not know that back then). Other manufacturers, like dCS, Musical Fidelity have the same problems. Its all Philips fault and their 'engineering'.
Krell at least did not left their customers empty handed, and enginereed a replacement drive that can be retrofited. NO OTHER manufacturer I know of did this. Give Krell credit for this !
At least Krell learned from their mistakes (or more precisely - Philips mistakes) and now uses the tried and tested Esoteric drive. It should be good for years.
FYI - the Denon drives that Mac uses also aren't reliability champs. Esp 201 drive, which is also very noisy.
FYI #2 - the $1500 upgrde is not an easy drive swap. The servoboard is replaced as well, the new (blue) display is fitted, complete with a big board, the size of the front panel. I belive it is $1000 parts and $500 labour.