Bringing a 1980s Vintage Marantz Amplifier Back to Life

This is the first real hifi that my family ever owned.
It soldiered on for forty years, but it now falls on me to revive this classic Marantz SR320 from 1984.
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Equipment used to film this video:
A-Cam: Sony A6700
TTArtisans 35mm lens
B-Cam: Sony ZV-E10
Sony 17-50mm kit lens
Rode Wireless GO II
Editing Software: Davinci Resolve
Editing Computer: M2 Mac mini
Monitor Speakers: Yamaha NS-10MX
Monitor Amplifier: NAD 3120