Alterations affecting common property by previous owner

We bought a unit (NSW) last year. Apparently one of the previous owners has moved the wiring and wall-plate that connects to the buildings TV aerial. It also appears no specific approval was obtained from the body corporate.

This has come to light as a result of the buildings TV aerial and wiring being upgraded because of the the digital roll-out. From the preliminary report of the contractor it appears there could be additional expenses incurred for our unit due to the changes in wiring and moving the wall-plate. There is nothing official as yet but there are indications that we may be asked to pay the additional expense rather than the body corporate.

Two questions (1) are we liable for any additional expense to the common property and (2) what about cost of taking up and relaying our floor covering ie. carpet and tiles?