2010 Lincoln MKT Questions

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Passenger side headlight bulb will randomly go off when driving or when parked. Occasionally passenger side headlight bulb will not even come on when headlights are turned on parked or driving. Anytime headlights are turned on the light from the passenger side headlight bulb can be seen quivering or wavering for a short time and then burns steadily but never quite as bright as the driver side headlight. Is this a bulb, ballast, igniter, wiring, switch problem or any combination of these? Vehicle has been extremely well maintained and has 133,000 miles on it. Lincoln dealership first said it was the battery and replaced it which did not fix the problem. Then they said it was the headlight bulb itself. I have lost confidence in them. I just want to repair the correct item without guessing and needlessly replacing parts. The problem shows up both when turning the headlight switch manually to the headlight position or leaving it in the auto headlights on position.
When in dual heat mode only cold air flows to the passenger side. Even in the driver side heat mode only some cold air still flows to the passenger side.
So the drivers side blind spot indicator works fine, but the passenger side does not. Also, when I back up there is no proximity beep, the back up camera works fine. How much would a repair like this cost?
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