As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE DUE TO THE NR 1 ENGINE BLEED OFF AND NO NR 1 ENGINE ANTI-ICE. PERFORMED PNEUMATIC HEALTH CHECK AND FOUND THE LT PRV FAILED, REPLACED THE LT PRV, PERFORMED COMPLETE HEALTH CHECK AND ENGINE RUN. AND PERFORMED OP CHECK OF LEFT PACK.