I'll second the line of thought.
Don't do it just for the sack of it.
I have been thru this, changed caps in an old amp and frankly didn't notice any change in SQ. Although upping the capacitor value of large filtering caps from 5000uf to 13000uf for each channel did help the bottom end of music (low fq.)
So coming back to recap, I changed the 30 years old Keltron caps with Nichicon FGs ( fine gold ) audio capacitors in the amp.
To my ears there was no audible difference.
At places I even swapped the simple Keltron cap with Nichicon MUSE caps too. But didn't find much difference to justify the pain and cost of recap.
Sansui amps from 70s used to have notorious black flag caps (polystyrene). They loose their value over the time and put the amplifier circuit into high frequency oscillation which takes out the output transistors. So changing them makes sense.
So, yes, for amps that are very old ( 40+ years ) there are certain caps that are notorious to go bad over the period or are prone to failure must be addressed but I don't think it serves any purpose to do all of them.
In your case Technics SU V7 is direct coupled amplifier, I think after a full recap you'd find it hard to tune and bias the amp easily.
so if it's working fine with no visible leaking or damaged cap, let it sing.
...the golden rule still applies.....
"If it ain't broke, don't fix it"
