Several of my dashboard selection buttons are not lit after dark..... ie.. 2 buttons for my radio/cd, my dimmer button & my recirculated air button. I recently purchased this vehicle 1 1/2 months ago from a local dealer & all displays were working when I purchased the vehicle although they did repair/replace the power window motor on the passenger side & my rear wiper motor ...... could this be an indicator of major electrical issues with this vehicle ????? I have a vehicle service scheduled next week to investigate my vehicle problems...... can anyone suggest what the problem might be ??? Thanks