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I have a steam engine 239 that was sitting in a box for 20 years.  Now i want to make a layout and use the 239 again.  The loco works great, even after 20 years of inactivity but i open the motor to clean it.After finding that the motor is a little bit complex for a beginner like me with loco maintenance, i wat able to colse the engine and make it run again.  My problem is that the button that was working before dismanteling and cleaning, is not working anymore.If i put it in automatic mode, it's ok, but if i push it forward only (or reverse only...), it still cycle reverse/forward.  I dismanteled again the engine and i have no clue of how this button is working, it is not connect anywhere!Also, i cleaned the brushes area and they broke into sand...  Where can i find the part number of these brushes and where can i see a video or some pictures of the interior of the 239 motor so i can reinstall the e-unit button inside the motor correctly?Thanks for helping me recovering my children best friend!Mick