What was found
NR 1 ENGINE U/L RED LIGHT IN EPR GAUGE ILLUMINATED AT IDLE DESCENDING THROUGH FL 280 RAN QRH AND CONTINUED. AT 8000 FT U/L LIGHT COME ON AGAIN WITH VIBRATIONS, RAN QRH AND SHUT ENGINE DOWN. DFDR DATA RETRIEVED SHOWS AN INTERMITTENT U/L DETECTED IN FLIGHT (MATCHING CREW REPORT). ADJUSTMENT WAS OUT OF LIMIT. ADJUSTED RT LWR STOW SWITCH AND OPS CHECK ALL NORMAL PER MM78-34-01-4. ALSO PERFORMED OPS TEST OF THRUST REVERSER SEVERAL TIMES AND OPS ALL NORMAL PER 78-30-00-5.