17.— Without prejudice to any defence otherwise available to, or immunity otherwise enjoyed at law by NAMA, a NAMA group entity or a person specified in section 34 (1), no action for damages shall lie against NAMA, a NAMA group entity or such a person in respect of or arising out of the performance or non-performance in good faith of any of the functions provided for in Parts 4, 5 and 6, or in respect of any decision made in good faith to perform or not to perform any of the functions provided for in Parts 8 and 9.