I have been logging them for years on any showroom hot tubs,we have a software program that I use for all testing I have performed also manually logged in a file for backup for any issues that happen.
That way any attempts at warranty disputes from manufacturers have been documented and done weekly,or bi weekly as per ownerships mandatory requirement for the job position.
We sold our first one Saturday and are delivering it next week so we will have our first customer adventure with a new system.