What was found
APU FIRE LEVEL 3 ALERT, MASTER WARNING ILLUMINATED, APU FIRE AURAL WARNING SOUNDED AND APU FIRE INDICATION IN APU FIRE HANDLE ILLUMINATED NEAR RZC AT FL350 CRUISING AT .85M. CONFIRMED INDICATIONS WITH F/O AND PERFORMED PHASE 1 BY PULLING AND ROTATING APU FIRE HANDLE TO DISCHARGE AGENT. WHEN INDICATIONS DID NOT SUBSIDE, CONFIRMED & ROTATED HANDLE TO DISCHARGE SECOND AGENT REMOVED APU GROUND FIRE CONTROL PANEL IAW MM 26-21-10-4. NO DEFECTS OR CORROSION FOUND. ENTIRE PANEL & WIRES FOUND CONTAMINATED WITH FLUID. CLEANED PANEL IAW SWPM 20-00-09. REINSTALLED PANEL IAW MM 26-21-10-4.