What was found
AFTER LANDING THE NR 1 THRUST REVERSER LEVER LOCKED UP AND WOULD NOT RELEASE FROM 1ST DETENT. NR 2 THRUST REVERSER OPERATED NORMALLY. SHORTLY AFTER LANDING, THE NR 1 THRUST REVERSER LIGHT ON OVERHEAD PANEL ILLUMINATED. NR 1 THRUST REVERSER LIGHT REMAIN ILLUMINATED ON OVERHEAD PANEL. ACFT GROUNDED. EAU BITE SHOWS NR 1 ENGINE STOW FAULT S834, DIR CONT VALVE SENSOR. SUSPECT BAD NR 1 AUTOTHROTTLE SWITCH PACK. R & R THE NR 1 AUTOTHROTTLE SWITCH PACK ASSY IAW AMM 76-11-07-401. ALL TESTED NORMAL. CYCLED THE NR 1 THRUST REVERSER SEVERAL TIMES. NO FAULTS.