As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT - AT TOP OF CLIMB RIGHT AND LEFT INLET FUEL PRESSURE LOW LIGHT ILLUMINATED INTERMITTENTLY. AFTER LEVEL OFF APU SHUT DOWN. NUMBER TWO ENGINE GENERATOR ON PLACARD. APU RESTARTED AT 10,000 FEET. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. REPLACED APU LOW PRESSURE FUEL FILTER AND APU COMBUSTION LINER. ALSO, REPLACED GENERATOR CONTROL UNIT AS A PRECAUTION. SYSTEM GROUND CHECKED NORMAL OPERATION.