Wurlitzer 140B, choked note, and general tone question

[hiverdude]

Hello!

I have a 140B that I've owned for about 5 years now.  I love the instrument, but have a couple questions.

There is a note, right in the middle of it, that is "choked"... it'll play the attack of the note just fine, and is quite clear, but it has very very little sustain.  I've replaced the reed, but it does exactly the same thing... I look around inside it, but I can't see anything obviously different between it and the notes around it.  Any ideas of what I should look at?

My next question is about the general tone of the instrument.  It sounds great, but I would describe it as very warm and mellow.  High end rolls off quite steeply above 2khz/3khz... I've had the electronics recapped, and the instrument sounded the same before and after...

I'm alright with it sounding like this, because it has its place in a mix, but I keep seeing people describing 140Bs as "spanky" and "bright"... my instrument is NOT this at all.  Just wondering if there are ideas there too.

Many thanks!

Colin