What was found
BEGINNING DESCENT FROM 5500 FT, PASSENGERS AND CREW BEGAN TO SMELL ACRID ODOR FROM CABIN ROOF VENTS. SECURED CABIN VENT BLOWER AND LOOKED FOR ANY SECONDARY INDICATIONS - NONE FOUND. AFTER NORMAL LANDING AND SHUTDOWN, FURTHER INVESTIGATION REVEALED SIGNIGICANT HYDRAULIC ACCUMULATION UNDER NR 2 HYDRAULIC MANIFOLD. NOTIFIED MAINTENANCE. MAINTENANCE REPLACED THE CABIN VENT BLOWER MOTOR PART NUMBER 76500-7901-103, SERIAL NUMBER 23-657 DUE TO BURNT WINDINGS AND THE NR 2 HYDRAULIC MODULE DUE TO FILTER BOWL LEAKING - O-RING HAS BEEN REPLACED PREVIOUSLY. THE TWO PROBLEMS WERE NOT RELATED.