The method i have adopted did seem strange at first as it is normal to
run the device (baring any ovious short circuits) However understanding
that these old caps are like having multiple short circuits in various
degrees, I will replace them one at a time using the schematic while
making notes i also see what circuit they are in and visualize the
problems created.

This snake pit must go!

These new parts will go in before the power goes on.
Trouble shooting and adjustments were easy.