As I realize that I most likely won't outlive the 30 yr. warranty on my roof and my wife will be left to deal with any issues that arise, I began writing a comprehensive user manual for the house. Electrical, HVAC, plumbing, and COM.
With lighting being essentially 100% LED and half of it being custom, even if professionals were called in, they would spend a good deal of time scratching their heads and then probably recommend pulling it out. Attached to the list is spreadsheet which identifies the fifty plus circuit breakers in three panels by circuit, along with a reverse search list.
The paint colors for each room, along with the manufacturer and mix codes are listed as well. For rooms that have been remodeled, stud locations are given.
We have a custom HVAC system with dual heat options. Ductwork has a dual configuration based on option selected. The wood burning furnace has its own special needs, such as maintenance of the furnace and flue. A project for this year will be to install a mini-split heat pump to the attic electronics workshop which will add yet another layer of complexity.
We have a private well and a septic system so info on these systems and a detailed description of operation is given. The water supply system includes the pressure tank, water softener, and water heater, along with the various shutoff valves. The septic system has a pumped drainfield so information on the pump and the fault sensor circuitry is given.
The COM system includes voice and DSL, WiFi, Ethernet cabling, and rooftop TV antenna with amplifier and distribution systems.
The bonus is that with my failing memory, I find the manual useful as well.
Now, if I can just remember where I put it.