A passive construction involving the use of intransitive suffix on the transitive stem (that is verb root plus transitive suffix). The P argument is unmarked here, A introduced as oblique; cf. (2b) ‘The salmon was baked by the woman’. It is not totally clear if P is promoted to S in this construction, although raising diagnostics suggest that passive is personal rather than impersonal. p. 233. R/Ben arguments can passivize; SEE(101) , but Ts as other obliques apparently cannot .
Source: Gerdts 1982: 233 (ex.101)