Governed by an eight-person Board of Directors, Members of the OCE Board are private citizens and cannot serve as members of Congress or work for the federal government. The OCE lacks subpoena power and must complete each review in a relatively short period of time—approximately three months at most.
And yes, there are more members of Congress that were under investigation under OCE that voted in favor for gutting OCE:
The move was spearheaded “by lawmakers who have come under investigation in recent years,” according to Politico. Among those speaking in favor of the changes were Rep. Blake Farenthold (R-TX), who was accused by a staffer of sexual harassment, and Rep. Peter Roskam (R-IL), who allegedly received “an impermissible gift when he and his wife traveled to Taiwan in October 2011.”