As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 905 - LEFT THRUST REVERSER UNLOCK LIGHT STAYED ON AFTER DEPLOYMENT. DEFERRED IAW MEL 78-1, CAT 'C' DMI NR 00210. REMOVED AND REPLACED REVERSER UNLOCK LIGHT MICROSWITCH IAW DOUGLAS DC-9 MM CHAPTER 78. OPS CHECK NORMAL SEVERAL TIMES. CLEARS DMI NR 00210.