Wouldnt hurt to replace the caps while you have it open. I have fixed plenty of 2609s and they required a cap change or replacement transformer more than anything else.
I have found that the SHOEI branded capacitors are actually good parts. That said, they are 35 year old electrolytics, so it is a good idea to replace them as preventative maintenance, and I did do this on my units. However all the old capacitors I pulled off the boards actually tested OK, and quality replacements for the larger power capacitor parts do cost several dollars (A$5.89 for the 2200uF 25V, and A$9.35 for the 10000uF 25V upgraded from 16V Nichicon branded from element14.com).
I did fix one unit that had one of the 0.1uF non-polarised glass caps at C13 blown (it had catastrophically exploded), that was presenting with a black screen.
Edited by HunterZero, Wed Apr 11, 2018 8:42 PM.