After notice and opportunity for hearing as provided in the regulations adopted by the Commissioner of Consumer Protection, the board may: (1) Suspend or revoke any license or registration issued pursuant to this chapter, (2) issue a letter of reprimand to any such license or registration holder, (3) place any such license or registration holder on probationary status with certain conditions, (4) issue a civil penalty in an amount not greater than one thousand dollars to any such license or registration holder, or (5) impose any combination of subdivisions (1) to (4), inclusive, of this section if it is shown that the license or registration was obtained through fraud or misrepresentation; or if the holder of the license or registration has been found guilty by the board or by a court of competent jurisdiction of any fraud or deceit in such license or registration holder’s professional practice; or if the holder of the license or registration has been found guilty by the board of negligence or incompetency; or if the board has found that the licensee or registrant has violated any provision of this chapter, or the regulations adopted pursuant to this chapter. Any action taken by the board pursuant to subdivisions (1) to (5), inclusive, of this section shall be a proposed final decision and submitted to the commissioner in accordance with the provisions of subsection (b) of section 21a-7. Appeals from the decisions of the Commissioner of Consumer Protection may be taken as provided in section 4-183. The board may authorize the Department of Consumer Protection to reissue any license or registration which has been revoked, and the board may modify or discontinue any action taken by it pursuant to this section.