128. Subject to Regulation 122, an employer shall ensure that—

(a) the employer's employees are not exposed to noise above the exposure limit value,

or

(b) if, despite the measures taken to comply with this Chapter, exposure above the exposure limit value is detected—

(i) immediate action is taken to reduce exposure to noise to below the exposure limit value,

(ii) the reasons for that limit being exceeded are identified, and

(iii) the organisational and technical measures taken in accordance with Regulation 125 are amended to prevent the exposure limit value being exceeded again.