CCM replacement on Volvo S40

[sizan]

Hi!
My CCM module has started giving me trouble—specifically, the fan speed adjustment knob doesn't increase or decrease the speed when I turn it, though it does start working again intermittently. At one point, the module's LEDs stopped lighting up entirely (for instance, the A/C LED—which is orange when off and green when on—wasn't lighting up at all), yet the A/C itself still works: pressing the button turns it on, and pressing it again turns it off. Basically, that’s the issue. I’m thinking of replacing the CCM with a used unit. Is it possible to buy one from a salvage yard and swap it in? What else do I need to keep in mind here? The CCM supports ECC, so I plan to look for a replacement that has all the same buttons and is identical to mine.
Thanks!