Did a very quick/brief search to see if this was recently discussed...but read the Jan issue of AOPA Pilot about borescopes, low compressions, and valve lapping.
https://www.aopa.org/news-and-media/all-news/2022/january/pilot/savvy-maintenance-cylinder-rescue
https://resources.savvyaviation.com/wp-content/uploads/savvy_pdf/exhaust-valve-lapping-paul-new.pdf
Great info that prompted me to venture further down the rabbit hole of learning. After a lot of reading I came across this video that I thought was just really informative for the non-mechanic pilot!
I found it interesting about the rotocoils/rotator caps and this definitely gave me another thing to keep an eye on at annual and with maintenance moving forward. I found it well worth the time to watch.