Find the vert out IC. Cold joints are common on them & that
goes on almost all brands.
For caps do this. Find the parts designation for the vert IC. This will be like
IC401. In this case all vert related parts will be marked in the 400 series.
Ex R407, C410 etc.
Find & change all the lytic caps marked C4## a few at a time then test.
The IC is cheap so if you order caps pick one up also. We usually changed it
even if it was just a cold joint. Customers felt much better if a part was changed anyhows. Some day I will write about customer psychology !!!
Good luck
73 Zeno
LFOD !