B757 FLT CREW HAS EICAS 'L ENG BLEED OFF' MESSAGE DURING TKOF; CONTINUES TKOF; DECLARES EMER AND RETURNS FOR LNDG.

Narrative

ON TKOF ABOVE 85 KTS; L ENG BLEED OFF LIGHT AND EICAS MESSAGE ILLUMINATED. CONTINUED TKOF AND ONCE CLR OF ARPT TERMINAL AREA MADE CONTACT WITH DISPATCH AND A 3-WAY COM WITH TECHNICIAN. TECHNICIAN RECOMMENDED REINSTATING L ENG BLEED. AFTER CAREFUL CONSIDERATION AND DISCUSSION; BOTH FO'S REINSTATED L ENG BLEED. SHORTLY AFTER REINSTATING L ENG BLEED; 'L ENG BLEED LIGHT' AND 'L ENG BLEED OFF EICAS' MESSAGE ILLUMINATED. FOLLOWED ACFT QRH PROC AND REFED ACFT MEL. TECHNICIAN SUGGESTED 'L ENG HPSOV' WAS INOP. AFTER DISCUSSION WITH DISPATCH AND CHIEF PLT ON DUTY; DUE TO EXISTING TSTMS AND FORECAST WX CONDITIONS ALONG OUR PLANNED RTE OF FLT; AND DIRECT IMPACT ACFT ANTI-ICE SYS DECLARED AN EMER WITH ZZZZ CTR AND ZZZ ATC. LANDED ZZZ OVERWT ACFT WT WAS 220300 LBS. AFTER SMOOTH LNDG FLAPS 25 DEGS AND NO AUTO-BRAKES STOPPED ON RWY WHILE ARPT CFR EQUIP INSPECTED ACFT. CFR STATED BRAKES COOL BY INFRARED DETECTION. GIVEN ALL CLR BY CFR CHIEF; FLT UNEVENTFULLY PROCEEDED ON TO GATE. WHEELS CHOCKED AT GATE RELEASED CFR EQUIP AND TERMINATED EMER WITH ZZZ TWR.