re: Weak oil leak/smell solved w/ PCV replacement & VTEC Solenoid Valve Assembly Leak
Finally got to look at the video, from what you've shown, it looks like it was pretty simple. For those of us with older High Mileage G1's, would probably be a good idea to change that when we have time. I'd guess heat cycles, and age, more likely than source but who knows, maybe Honda had a bad batch. I'm due for an Oil Change soon, so I'll look at mine more then.
Anything more you can add to removal/install would be helpful for others...