The Expedition has been assigned 979 TSBs over 23 model years.
TSBs contain recommended steps and procedures for diagnosing or repairing a known problem. They are issued directly by Ford to service technicians. You'll often see TSBs used as evidence in lawsuits when owners feel the automaker should help with repairs.
A TSB can cover multiple models and years. The 1997 Expedition has been involved in the most campaigns with 373 total service bulletins.