I got my 150 back today from BK safe and sound!
I think I may have thrown something off when I was messing with the Gain and Vert / Horiz pots (R915 and R916) because the 2 channel output seems slightly off. It doesn't look symmetrical on the bottom and top half like it used to and the dot seems to move in a curved fashion with audio instead of a linear. Here is an example:
Should I follow section 8 of the service manual? I think I may need to adjust the vertical / horizontal pots R915 and R916. See section 8 of the service manual. Though I'm not sure how to "feed in 130mV to the 'scope inputs, front R' jack and adjust R915 (HORIZ) to obtain a horizontal deflection of about 4cm."