What was found
AFTER T/O, HIGH PITCH NOISE FROM UNDER COCKPIT. THE CABIN OUTFLOW WAS CLOSED AND AVIONIC FAN OVERRIDE CAME ON. A/C WOULDN'T PRESS AND CLIMB STOP AT 10,000 FT, DUMP FUEL AND RETURNED. T/S FOUND WINDSHIELD WIPER MTR ASSY PANEL SEAL OUT OF POSITION. REPOSITIONED SEAL, CKS OK.