speaker question
Since yours squeals, the suggestion I can make is to swap it with another speaker and see if the problem follows the speaker.
The dash speaker is not difficult if you know how it's supposed to come apart. I'm sure you could do better than the previous tech. A lot depends on your level of comfort working with cars.
On the right-side dash speaker there's a removable strip on the left side. I believe it's supposed to be slightly pushed toward the window and pried upward, while taking care not to mar the dashboard. Carefully keep prying until all the tabs on the strip are free from the slots. Don't rush and don't get frustrated. After that it's all nuts and bolts. My replacement speaker from MB cost $25.



