Swagger897

The XXXVU/VE are panel identification numbers. Each of the first two numbers are particular to that panel's location and function, and the last number will either be odd for the left side of the aircraft, or even for the right (hence 411, 413 and 417 being shown on your screenshots). For an explanation of the + signs, here's a good read: https://aviation.stackexchange.com/questions/43916/what-does-this-plus-cross-sign-on-this-electrical-panel-mean

Currently APU bleed air is able to surpass it's ceiling of 23,000 feet.