(2) The complaint, supplemented as appropriate by interviews of the complainant, must allege the existence of facts and evidence to make a prima facie showing as follows:
- (i) The seaman engaged in a protected activity;
- (ii) The respondent knew or suspected that the seaman engaged in the protected activity;
- (iii) The seaman suffered an adverse action; and
- (iv) The circumstances were sufficient to raise the inference that the protected activity was a contributing factor in the adverse action.