My reasoning for printing the other timer settings was to investigate other potential interrupts which might be causing issues during startup. Also, I don't know all of the details, but I do know there are ways to make timers interact in a modulating fashion, so I turned the other timers off out of an abundance of caution, and to rule out other timer interference as a root cause. This was confirmed in testing, so I agree that I should be able to deal with timer 3 registers directly (or whatever timer is used for a particular object of my CL42T class).