Who is responsible?

It has been discovered that the Telstra connection box in the Electrical Room needs attention.  There is no cover on it (we are told it should have) and the state of it is dubious.  Being behind a locked door does it matter?  Is the OC responsible for repairing/replacing this.  Our SM indicates the OC should fix it as it is on common property but is it the OC’s responsibility?  I’d contact Telstra but I don’t know what department I should talk to.

Helen