Pittsburgh Technical College has been placed on probation and is at risk of losing its accreditation, the latest blow to the 75-year-old North Fayette institution that has been fighting controversy over concerns about its financial stability and leadership. PTC’s accreditor, the Middle States Commission on Higher Education, said on its website that the college has provided “insufficient evidence” of compliance with standards related to ethics, finances and governance. The college will remain accredited while on probation, the commission said, but must produce an extensive “monitoring report” by May 1 demonstrating efforts to regain compliance.