I have an 5702, got it in the early '80s, second hand, it was only a year or two old.
Generally great scope, still on my bench.
Now some of the switches, AC, GND, DC, and the input attenuators start getting intermittent, though I only used the scope lightly during the years.
Exercising the switches helps temporarily.
I guess I need to take it apart and clean the switches.
Good luck, Peter