Final update…
It works!
I spent more time trying to understand the schematic and how to follow the signal path. As I mentioned early on, I have no electronics background so with my limited knowledge, I continued testing with the audio probe. I found one suspect component, the 4.7uf at C7. I replaced it and lo and behold, I have wah!
Thanks to you Cybercow for your help and immense patience. I have learned a lot and I thank you for that as well.
Now to get it into a box!
Regards,
Alex