In response to a few requests, I've put together this page to help people find the various screws that must be removed to expose the player mechanism in a typical upright player piano. The following text was extracted from an email that was sent to a customer. For clarity sake, Fig-1 is looking at the front of the piano, and Fig-2 is looking down from the top of the piano.

Attached to this email are two simple drawings to aid you 
in removing the wooden pieces from the front of the piano. 
It might be best to print out the pictures so you have them 
on hand when you are at the piano. 

Color Code  ---   Name of the Piece
--------------------------------------------------------------
Light Blue  ---- Frame or Cabinet
Dark Red  ---- Front Board
Red  ---- Bottom Board
Green ---- Shoulders
Yellow/Green  ---- Music Desk
Dark Purple  ---- Key Slip
Purple  ---- Key Blocks
Dark Blue  ---- Fallboard or Key Cover
-------------------------------------------------------------

1) Open the top of the piano and look towards Point A. (Fig-2)
    There you will see some type of clip, hook or slot. Depending 
    on what is there, unlatch, or unhook the Front Board from the 
    Shoulders. In 99% of all pianos, you should not have to unscrew 
    any screws to remove the Front Board.

2) Next, remove both Shoulders. Normally there are two fairly 
    large wood screws that holds each Shoulder to the side of the 
    Cabinet. Remove all four screws.

3) Next, remove the Music Desk. Normally there is one wood 
    screws underneath each Shoulder which can only be seen 
    once the Shoulder has been removed. Remove both screws. 

4) Next, remove the Fallboard. Normally there are only two screws 
    that hold the Fallboard in place and they are located near 
    Point D (Fig-1). Also, they are almost always on the back-most 
    edge of the Fallboard. The screws are only visible once the 
    Music Desk has been removed.


   To remove the Bottom Board, there are normally two springs 
   located in the vicinity of Point E (Fig-1). Just push them up 
   (or depress them) and then pull the Bottom Board towards 
   you from the upper edge (or top) of the board. There are usually 
   three or four wooden guide pins that keep the bottom of the 
   board in place.

With regards to the levers and controls on the instrument, see 
the following webpages:

https://www.player-care.com/how_to_operate.html
https://www.player-care.com/standard_tubing.html