I have a 9560, and I’ve personally replaced the ssd, ram, battery (multiple times, both sizes), ac jack, and wireless adapter, plus redid the thermal paste, this all in the 5 or 6 years that I’ve had it. It’s pretty easy to work on, you just need a Phillips and a few sizes of torx. The official service manual is a huge resource there.

My L15 Thinkpad looks comparable too, though I’ve only done the ram it’s also just a matter of removing some screws.