Hello tv beta guy,
If you know where the vertical output transistors are in the set look at the reference number for them stamped on the PC board. Example- Q61=vertical output transistor 1. All the other components relating to the vertical output section would start with a 6. So, electrolytic caps in the vert output section would be numbered C65 for example. Also, another way to check electrolytics in circuit if you don't have an ESR meter is to use a multimeter with capacitance function. It won't be as reliable as an ESR meter but it will give you a pretty good idea if an electrolytic has dried out. If the cap says 100uF on it and it measures say 5 or 10uF in circuit then chances are very good it is opened up or nearly so. Good luck with your set.

Jeff