I don’t know for these. C-checks for 737NG are performed every 730 days and include corrosion/wear checks for the most stressed parts, but not all parts (which

I don’t know for these. C-checks for 737NG are performed every 730 days and include corrosion/wear checks for the most stressed parts, but not all parts (which are checked at D checks): https://en.wikipedia.org/wiki/Aircraft_maintenance_checks https://en.wikipedia.org/wiki/Aircraft_maintenance_checks