You're reading too much into this.  "Fix" in this sense just means "set", it doesn't infer that the fees charged by the auditors are out-of-line, the national firms are usually competitive on fee scale.  

Too bad the auditors are unable to "fix" the directors or at least draw public attention to their weaknesses as does the Auditor-General in reviewing the abuses in sectors of the Canadian civil service.

 

PB