Internal Speakers and Headphone Jack not working. Bluetooth does work.

While working on some music production, my sound suddenly stopped working. I would use bluetooth but much of my work requires a higher fidelity than bluetooth allows. Both USB and HDMI are viable options except those ports are often needed.

It seems that when using the headphone jack to do a line out to a pre-amp for my headphones it caused something to happen that has since disallowed my speakers (internal or headphone jack) to work. When trying to adjust the volume it shows a prohibitory symbol (a circle with a slash through it). When looking in System Preferences > Sound > Sound Effects and then on the drop down next to where it says "Play sound effects through:" internal speakers or headphone jack (when something is plugged in) is not an option.

I'm wondering if there is a part that can be replaced or if the audio components are part of the Logic Board. I see that it is possible to change the speakers and microphone, maybe something else. I'm lacking confidence about any of those things fixing my issue.

I have tried all of the software options (PRAM reset, etc), that I know about, some more than one time. Thanks for assistance.