How to do you keep track of your rig's to-do list?
I'd prefer to use a dedicated app to track my to-do list of future diagnostics, repairs, and upgrades for my rig. I'd even use a well formatted spreadsheet if someone had a template to copy.
I'd like to be able to assign priority, type of repair/upgrade (necessary, QOL, off-road, etc.), prospective cost, parts needed.
What do y'all use to ensure you don't lose track of all those things?