Boeing faces a new regulators’ investigation after the planemaker said it might have failed to properly carry out some quality inspections on its 787 Dreamliner planes.

According to The Guardian, the Federal Aviation Administration (FAA) said it was “investigating whether Boeing completed the inspections and whether company employees may have falsified aircraft records”.

The FAA said that, while the investigation was under way, Boeing employees would reinspect the Dreamliners that had not been delivered to airline customers yet, and the company would develop an “action plan” for the planes that are already in service.

The FAA said Boeing “voluntarily informed us in April that it may not have completed required inspections to confirm adequate bonding and grounding where the wings join the fuselage on certain 787 Dreamliner airplanes.”

The news comes as the latest in a string of incidents that have led to accusations against the company for placing profit over safety, from internal whistleblowers, regulators and even passengers.

Read More: Boeing Sharply Criticized at Two Senate Committee Hearings

The Boeing executive overseeing the 787 program, Scott Stocker, wrote in an internal memo, seen by the Guardian, that the problem was reported by an employee and was an instance of “misconduct,” but not “an immediate safety of flight issue.”

The memo said the company concluded that “several people had been violating company policies by not performing a required test, but recording the work as having been completed.”

“We promptly informed our regulator about what we learned and are taking swift and serious corrective action with multiple teammates,” the memo added.