is on despite it NOT being low. Local shop says it could cost up to 400.00 if the tank has to come out. If I don’t have it fixed, I can’t reset the “routine maintenance needed” light. So two warning lights come on at every startup.

 

The shop is estimating up to $400 because the tank may need to be removed to fix the issue. If you don’t get it fixed, the "routine maintenance needed" light will stay on, and you'll have two warning lights at startup. It's best to get it addressed to avoid further issues, but if the cost is too high, you could consider getting a second opinion or resetting the light yourself temporarily.