OK, if I understand correctly, you have to follow this:
1st secret you mentionned:
When you find where the gold key is located, just goes out of the room, turn left. now you are in front of a stair that goes down: on the right you can walk on a small ledge till the vent square pipe, and jump on top on it... then look for a hole on the left, jump in, you found it
Second one
It can be opened from the gold key place if remember well: there is either a screen to shot, or a button to push that says "Secret Door opened" if I remeber well... then the door you mentionned on top of a ladder is opend and the secret available
In case I am wrong, drop me a shot of the place you are looking the trick for
1st secret you mentionned:
When you find where the gold key is located, just goes out of the room, turn left. now you are in front of a stair that goes down: on the right you can walk on a small ledge till the vent square pipe, and jump on top on it... then look for a hole on the left, jump in, you found it

Second one
It can be opened from the gold key place if remember well: there is either a screen to shot, or a button to push that says "Secret Door opened" if I remeber well... then the door you mentionned on top of a ladder is opend and the secret available
In case I am wrong, drop me a shot of the place you are looking the trick for

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