To be honest there are no electronics in an L-2000 that aren't replaceable, so don't be too afraid of breaking something. Preamps, pots, and capacitors are all available online, not only Mighty Mite's New-Old-Stock ones but also better spec stuff sold by third parties, including myself. Big thing when pulling off friction fit pots is to apply even pressure when lifting.
This video has a nice technique for doing it:
I'd not seen that before. I'll see if there's enough gap to do it. Normally they pull off more easily.