As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EQUIP COOLING FAN ALTN LT. ON. GROUNDED - YES. DIVERSION TIME 31 MINUTES - REF LP 60175101 EQUIP COOLING EXH. NORM INOP AS WELL. FOUND EQUIP COOLING EXH LOW FLOW SENSOR COMPLETELY CLOGGED CAUSING BOTH NORM & ALT TO FAIL. VERIFIED BOTH FANS ARE RUNNING - AFTER REPLACING LOW FLOW SENSOR REF B737-800 AMM 21-27-03-400-802 OPS TEST OK.