As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE SHOWED "RECENT FAULT" CODE 78-21541 EACH REVERSER SLEEVE HAS ONE POSITION SIGNAL OUT OF RANGE. THIS IS A SHORT TIME FAULT. GROUNDED - YES. REMOVED AND REPLACED J10 HARNESS IAW AMM 73-21-06. ALSO REMOVED AND REPLACED MW0304 HARNESS IAW AMM 71-51-03. OPS CHECKS ACCOMPLISHED REPAIR CONFIRMATION IAW FIM 75-34 TASK 815 ALL TEST GOOD. ACCOMPLISHED OPS CHECK OF HARNESS IAW AMM 71-51-03-400-801 ALL TEST GOOD AND MM 73-21-06-400-802 ALL TEST GOOD.