MD11 CREW HAD ANTI-ICE DUCT OVERHEAT WARNING IN PHX CLASS B AIRSPACE.

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#2 ENG ANTI-ICE VALVE DEFERRED AND LOCKED IN 'ON' POS. BECAUSE OF DEFERRAL; MAX PWR TKOF REQUIRED EVEN THOUGH GROSS WT JUST 400000 LBS. BRIEFED POSSIBILITY OF HIGH EGT'S AS AMBIENT TEMP WAS 42 DEGS C. PASSING 2000 FT AGL; ENG #2 ANTI-ICE DUCT ALERT CAME ON. I REDUCED #2 PWR IMMEDIATELY AND ALERT (WHICH I BELIEVED WAS A LEVEL 2) WENT OUT. AFTER CLEAN UP; CALLED FOR ENG #2 ANTI-ICE DUCT CHKLIST WHICH CALLED FOR ENG SHUTDOWN AND RETURN FOR LNDG (NEAREST SUITABLE FIELD). UNEVENTFUL LNDG MADE AT PHX RWY 26R. REPAIRS WERE MADE TO ANTI-ICE DUCT AND DEPARTED 26 HRS LATER. 2 DAYS LATER AT HOME; READING MD11 FLT MANUAL; I DISCOVERED THAT THERE IS NOT A LEVEL 2 ALERT. ENG #2 ANTI-ICE DUCT (BOXED AMBER) BUT A LEVEL 1 EXISTS BY THE SAME PHRASE (AMBER ONLY). THE SHUTDOWN IS REQUIRED FOR A LEVEL 3 ALERT; ENG #2 ANTI-ICE DUCT. MY CONCERN ABOUT THE ENG #2 ANTI-ICE VALVE LOCKED OPEN DEFERRAL CAUSED ME TO RUSH AND MISIDENT THE LEVEL OF THE MALFUNCTION. THE LEVEL 1 ALERT ALLOWS CONTINUATION INFLT BUT PROHIBITS TKOF IF ON GND. MY DECISION TO SHUT DOWN AND RETURN WAS BASED ON THE WRONG CHKLIST. HOWEVER; WITH THE ANTI-ICE VALVE LOCKED OPEN AND A BLEED AIR LEAK DETECTED (EVEN THOUGH IT WAS LEVEL 1) I WOULD PROBABLY HAVE RETURNED ANYWAY. THE FACT THAT THE LEVEL 1 AND LEVEL 3 ALERTS ARE IDENTICAL PHRASES IS A SET-UP FOR CONFUSION IN HEAT OF BATTLE.