Rancho Cordova, CA – Federal investigators are blaming Pacific Gas & Electric for a deadly natural gas explosion in 2008 in a Sacramento suburb.

The National Transportation Safety Board’s final report says PG&E workers used a defective piece of pipe for a faulty repair in 2006. The pipe pulled loose, causing the Christmas Eve gas leak at a Rancho Cordova home.

According to the board’s final report released Friday, a maintenance crew was then slow to arrive despite repeated calls from a PG&E technician. By then it was too late.

The blast killed 72-year-old Wilbert “Bill” Paana. It also critically injured Paana’s daughter and granddaughter.

PG&E says it has since make changes to avoid future problems.