Identify panzer IV bottom access covers

[wds]

I was just curious if any of you Panzer IV experts could tell me the purpose of any of these access covers on the bottom of the IV. This is the Tamiya kit. Identify and win a prize!*
1.
2.
3.
4. Escape hatch?
5.
6.
7.
8.

Thanks,
Bill

*Sorry, bragging rights only.

 

[wds]

Re: access covers

G. Cooper came up with the following for me. Thanks.

1. brake band access cover
2. brake fluid drain port cover
3. transmission fluid drain port cover
4. Escape hatch / relief port
5. radiator fluid drain port cover
6. engine oil drain port cover
7. engine oil drain port cover
8. radiator fluid drain port cover

Thanks for looking,

Bill