As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 60 - PRECAUTIONARY SHUT DOWN NR 4 ENGINE AT 0003Z DUE TO ENGINE ROUGHNESS NR 4 ENGINE NR 4 CYLINDER BOTH DISTRIBUTORS HAD AN OPEN AND THEN LOW COMRPESSION PATTERNS. MAINTENANCE REPLACED Y-LEAD, FRONT PLUG AND SHORT LEAD. AIRCRAFT RETURNED TO SERVICE. (X)