As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - AT TOP OF CLIMB LEFT ENGINE ROLLED BACK. ENGINE PRESSURE RATIO REMAINED STEADY AND ENGINE POWER DROPPED TO IDLE. RETURNED TO SJU AND LANDED WITHOUT INCIDENT. REPLACED NUMBER ONE ENGINE ENGINE PRESSURE RATIO SENSOR TUBE. SYSTEM GROUND CHECKED NORMAL OPERATION.