As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT AT APPROXIMATELY 27;000 FEET CREW NOTICE ABNORMAL SMELL THROUGHOUT COCKPIT AND CABIN. SMELL DESCRIBED AS WAXY OR OILY.<[01] COMPLIED WITH SMOKE AND FUMES CONDITIONAL INSPECTION PER MM O5-51-56. FOUND A HYD SYSTEM SERVICED T0 96% AND B SYSTEM AT 106%. DRAINED AND SERVICED PER AMM 12-12-00. REPLACED A&B RESERVOIR CROSS FITTING CHECK VALVES PER AMM 29-09-04. REPLACED RECIRC FAN FILTER PER MM 21-25-01 AND WATER SEPARATOR SOCKS PER MM 21-51-05.