I understand where you’re coming from bubbles (an interesting pseudonym in these circumstances) but again, strictly speaking, the Owner of the adjoining Unit could not be held responsible unless they were themselves aware of the leakage and didn’t report it; and how could that be proven in your circumstances?
Similarly, I agree with you about the replacement of your carpet, and whilst that matter too should be part of your submission to your Executive Committee (not to the Building Manager), if it’s not well received, it may be expedient for you to lodge a Claim against your Contents Insurance and seeking to then only claim your excess from your Owners Corporation.