What was found
DURING TAXI AFTER ENG START "RIGHT BLEED OFF" LIGHT ILLUMINATED W/ "R BLEED OFF" EICAS MESSAGE. A/C RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C. FOUND RT HPSOV LOCKOUT PLUG RETAINER CABLE IN BETWEEN PLUG AND HOLE, ALLOWING AIR TO BYPASS. REMOVED OLD, THEN INSTALLED NEW RT HPSOV PER AMM 36-11-07. LEAK CHECK OK. OPS CHECK UNABLE; HOLE IN ECS TUBE. SEE L/P 39434-42/2. REMOVED AND REPLACED HPSOV TUBE AS REQUIRED IAW AMM 36-11-07. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. ENGINE: PWA, JT9D7R4D