What was found
FWD EQUIPMENT VALVE EICAS DISPLAYED PLUS OR MINUS FOUR SECONDS IN CLIMB. REOCCURRED AT 34,000 CRUISE, EQUIPMENT COOLING SELECTOR TO STANBY IAW QRH. WARNING EXTINGUISHED. DURING TROUBLSHOOTING PERFORMED MANIFOLD INTERCONNECT VALVE TEST. STEP 2 H FAILED AFTER 45 SECONDS. MM 21-58-00-705-342-001-1.SUSPECTED K2193 RECHECKED SYSTEM, OK IAW 21-58-00-705-342-001.1 (F) SIMULATION OF ALTITUDE ABOVE 10,000 FT.