(a) If the preliminary investigation discloses that the allegations or appearances are neither unfounded nor frivolous, or if sufficient cause exists to warrant full inquiry into the facts and circumstances indicating that a judge may be guilty of willful or persistent conduct which is clearly inconsistent with the proper performance of his duties or casts public discredit upon the judiciary or the administration of justice, or that he has a disability seriously interfering with the performance of his duties, which is, or is likely to become, permanent in nature, the commission shall conduct a full investigation into the matter.

(b) The commission shall inform the judge in writing that an investigation has commenced and of the nature of the matters being investigated.

(c) The commission may request the judge's response in writing to the matters being investigated.