Reviving a VERY high-end 1970s tuner...The Yamaha T-2

Need tools? Here's a video showing what I use (with links!): https://www.youtube.com/watch?v=MLK649c1_fM This tuner was very obviously malfunctioning, but the moment I tried to figure it out with test equipment, it started working again! And then it never malfunctioned again! I did my best to bring it back up to speed with new lamps, a few new caps, and an alignment.