—(1) Where a notice has been served on the owner of a flat by a public authority requiring that owner to carry out any work in relation to that flat and the notice is not complied with, the body corporate may carry out the work.
(2) Where the owner, mortgagee in possession, lessee or occupier of a flat fails or neglects to carry out any work necessary to remedy a breach of the duty imposed on him by section 21(a), the body corporate may carry out that work.
(3) Where the body corporate carries out any work in relation to a flat pursuant to subsection (1) or (2), it may, subject to section 17(3), recover the cost of doing so, as a debt —
(4) Where —
any part of a building comprised in a flat contains any structural defect which affects or is likely to affect the support or shelter provided by that flat for another flat in that building or the common property; or
any defect occurs in any pipes, wires, cables or ducts referred to in section 21(a)(ii) within a flat,
and the defect is not due to any breach of the duty imposed on any person by section 21(a), the body corporate may, at its own expense, carry out such work as is necessary to rectify the defect.
(5) Where the body corporate incurs any expenditure or performs any repairs, works or acts that it is required or authorised by or under this Act or by or under any other written law to perform (whether or not the expenditure was incurred or the repairs, works or acts were performed consequent upon the service on it by any Government or statutory authority of any notice or order) and the expenditure or the repairs, works or acts were rendered necessary by reason of any wilful or negligent act or omission on the part of, or breach of any provision of its by-laws by, any person or his tenant, lessee, licensee or invitee, the amount of that expenditure expended by it in performing the repairs, works or acts shall be recoverable by it from that person as a debt in an action in any court of competent jurisdiction.