Help with pot adjustment for original pce CDROM unit

[Adampce85]

I recently acquired a PC engine briefcase unit and have noticed that in two of the three games that I have, that the music will occasionally drop out completely. After sharing this issue with a pce/turbo group on Facebook, I was told by several people who have quite a bit more experience in this area that a pot adjustment should fix the problem. Does anyone here know/have the pot positions of a fully working cd unit? I have never done any sort of repairs on a console before and do not wish to make the problem worse. Thanks. -Adam