What was found
NR 1 BLEED FAILED IN ICING CONDITION THEN ANTI-ICE FAILED. R & R HIGH STAGE BLEED VALVE ON NR 1 ENGINE IAW AMM 36-11-01. R & R NR 1 ENGINE NAPRSOV IAW AMM 36-11-03, ALL OPS CHECK GOOD. MFG, NAPRSOV, PN 1013952-1, SN 2011100012, TAT 2186, TAC 1412, TIME SINCE 2186. BLEED NR 2 IS CURRENTLY ON MEL.