As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF ACK JIC 2-2020B ITEM 16 SHOW MAINT MSG 26-41010 SMOKE DETECTOR M23490 CONNECTED TO OEU 1-1-3 FCR COMM ON AREA IS FAILED. SLAVED IN TWO NEW SMOKE DETECTORS, NO HELP. CONNECTED BACK ORIGINAL SMOKE DETECTORS. TRIED OEU AT 1-1-2, 3, 4. NO HELP. CHECKED WIRES FROM OEU TO SMOKE DET REF WD 26-14-51, CHECKED OK. TEST LIGHT COMES ON SMOKE DET DURING TEST, BUT NO TEST TONE. RELOADED OEU SOFTWARE AND DATABASE. ACCOMPLISHED SUCCESSFUL SMOKE DETECTION TEST FOR FCR.