We have a 2000 Quest GXE, every option. It has over 132,000 miles, and I'd
like some suggestionsfor repairs.

Problem #1: Two days after the 130,000 mile service, a loud roar appeared.
It sounded like the engine, only louder.  It's heard better from the 3rd row
seat, and I suspect the muffler.

Problem #2: The sliding doors on both sides occasionally stick.  It happens
when one hasn't recently been opened, and it's occured since Day 1.

Problem #3: 2 of the 4 speakers have failed.  I'm not sure whether it's
wiring or a bad speaker.  The speakers are the 2 in the driver's door, and
I'm not aware how to remove the door panel.  The radio is the factory AM/FM
Casette/Single Disc, and the infamous display problem was resolved last
March.

Problem #4: The TV/VCR set has completely died.  It won't turn on at all.
I'm not sure if it's a fuse, a weak battery, or a failure in the set.

The van is away and will not be accessible until Saturday, so I have plenty
of time to plan repairs based on suggestions.

Also, while I'm thinking about it, we have a 2004 Frontier Desert Runner
with bubbling weatherstripping around the driver's window.  We took it to a
dealer and they said only one other customer had had the problem and it was
in a 2003 Xterra, and it's a $50-$100 fix.  Any do-it-yourself remedies?

Thanks in advance!