If you are worried about preserving the value of the unit, leave it alone or get a service center that specializes in pre-war trains to do the work. I don't buy or sell trains for investment purposes so I don't keep track of this sort of thing.
I can't say if your 10 E is in it's original state. Some of these units were sold as kits (Bild a Loco) and some were worked on by serive centers that would have substituted parts when the train went in for repairs.
You can get a replacement for the pickup roller assembly from places like Brasseur. There should be a brass and tin assembly with real rollers.
http://www.traindoctor.com
The 10 has a manual reverse, the 10E has the automatic reversing unit (or "E" unit). I'm not really up on current prices, so I'll let someone else field that question.
- Clint
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