ISS fastening system hardware use anaerobic Liquid Locking Compounds (LLCs) as a means of meeting secondary locking feature requirements. During ground vibration testing, joints that had been assembled with LLCs failed to prevent fastener loosening (i.e., preload loss).
Yep, but a specially formulated version is required for the temperature extremes and vacuum of space. Since that document indicates that NASA already knows this, we can assume they used the stuff. The conclusion might be that something else caused the problem.