Flight Levels has a good article about post-maintenance checks:
https://flightlevelsonline.com/2023/commander-tips-post-maintenance-checks/One thing I have done consistently after every 150 hour is a test flight, going high enough to make sure the pressurization is working. For whatever reason, I have had a couple of occasions post-maintenance where the pressurization no longer worked. So I go up to 12,500 or so and make sure it's making at least some differential.
