To DYI or not to DYI?

Thank you for the your input. It will helps me decide on to do with my Marantz amp.
I was looking at this kit on eBay for $185  - which I believe it's on the high-end but might pretty thorough on the layout.
Marantz 1150 1150D 1152DC amplifier rebuild restoration service kit
https://www.ebay.com/itm/164155407528?ViewItem=&item=164155407528

Then there is this kit out of Europe that's maybe a little less but I might be on my own on where the parts are to go.
https://www.audio-high-store.com/product/marantz-1152dc-upgrade-kit-audio-capacitors/

Another thing. Some kit don't include the power caps like this reasonable $50 kit from Reverb.com  Is replacing the power caps necessary?
https://reverb.com/item/27104330-marantz-1152dc-restoration-kit-caps-trimmers-transistors-quality-pa...

Usually the power caps are the first ones that people talk about replacing.

If you’re going to crack it open, I’d go all the way. You would immediately start to plan a PS cap replacement the second you plugged it in and decided the first mod was successful, no??

Got it. I didn't know if they are a problematic caps or it's just a matter of upgrading. Thanks.

Is replacing the power caps necessary?

Yes.

One helpful tip: When replacing electrolytic capacitors, be careful to observe polarity of the parts you remove and those you install! failure to do so will result in a damaged part- the cap will draw power and heat up rather quickly. Once they've heated up they are not reliable. So make sure you get this bit right!!