hahaha, nothing work... i think i lost my head

Location of 24 balls for Elevator Puzzle in Chapter 2:

At first location, far left screen before elevator:

1. & 2. Two blue balls on lamp post, left
3. & 4. 2 orange balls to right of lamp post
5. green ball in horn above water wheel
6. green ball in base of lamp post (open with switch by train tracks)
7. blue ball behind lamp post by train tracks
8. orange ball inside vacuum cleaner shaped thingey in center screen
9. green ball in hatch, upper part of round building
10. green ball in train track light, far right
11. orange ball in train track light, far right

In underground room, with little man:

12. orange ball on cabinet shelf
13. blue ball in cabinet (open door)
14. orange ball on chair
15. orange ball in chest
16. blue ball in basement
17. blue ball in medicine cabinet

At far right location by train and elevator:

18. blue ball in roof over train
19. green ball in tree to left of airplane pic
20. green ball in grass below train
21. green ball on antenna above elevator control box
22. blue ball bottom right near battery on elevator control box
23. green ball - left of three holes above elvator battery device
24. green ball in grass behind rear of train

Location of Fishing Sinkers:

1. in cabinet next to man in teapot room
2. below teapot room - open wooden blinds with handle
3. in screen 2 right of plane, below handle to blinds, open compartment
4. in screen 2, in large orange pot, bottom back left
5. in screen 1, (by plane) on lamp post
6. in screen 1, in blue flowers by left Bldg.
7. in little building left of plane, (down stairs), center of room
8. in lake behind boat
9. in hatch (open it) in front of Mayan building
10. inside Mayan building
11. inside Mayan building, on ship

Location of Little Boats:

1. open hatch in screen 2, bottom left
2. above blue arrow in screen 2, in flowers
3. in little building, down the stairs, screen 1
4. near the boat, very bottom center of screen
5. above Mayan picture, on building
6. inside Mayan building, on pic of boy
7. inside Mayan building, on paper on back wall
8. mis-wrote my notes, # 8 is somewhere in fishing sinker list

4 digit numerical code: 3 1 3 2

Go upstairs and click on the checkerboard.