During the agreements with Rome, was sex abuse ever brought up by SSPX?   

Several parents brought their concerns to Father Patrick Crane, who is now with another Society of Saint Pius X church – Our Lady of Sorrows in Phoenix.
Crane told investigators last month that he was aware that a boy claimed Sloniker had forced him to strip naked and then whipped him.
The priest said Sloniker worked with the church camp from 2003 to 2006, and Crane said he recalls that he did not ask the trucker back after learning about the boy’s claims.
“Crane said he remembers part of it, but it was mostly because (the boy) did not want to attend the camp,” police said.
The priest said he did not think there was enough evidence to report the incident, although Crane said he was aware the boy’s claims were made “during the time the church was being looked into for other abuse allegations across America.”
Other parents said they warned Father James Haynos, the church headmaster, and Father Paul Vassal about Sloniker, although it’s not clear they ever took any action to investigate the claims.
Vassal told police he knew about Sloniker’s circuмcision attempt, although the priest said he was unaware of any sex abuse claims against the trucker from that period.
Haynos, who now lives in Kansas, said he knew nothing of sex abuse allegations against Sloniker — although he said the failed seminary student’s “unstable mindset” should have disqualified him from “a position in which he would be in charge of kids.”

I believe Fr. Crane request and was re-assigned to the Immaculate Conception Academy at SSPX Post Falls.