" I guess it all comes down to the old argument of dealers vs independents. The dealers tend to replace things, independents tend to fix things."
One of the best things you can know in life is what to expect from the people with whom you work. Knowing their nature can give you a far better idea of what to expect.
IMO, it really depends on whether fixing the “obvious” problem will be the end of it, or if it represents the first failure in the system. Since you don't know, a second opinion is the key.
Best of luck!