What was found
ON FLIGHT NUMBER 2423, COWL AND ANTI ICE ON, CLIMBING THROUGH 290,000 FFET, SELECT WING ANTI ICE OFF AND GET NR 1 ENGINE BLEED CAUTION. HALFWAY THROUGH CHECKLIST, GET A RT PACK MESSAGE. INTERROGATED MDC, NO ASSOCIATED FAULTS IN FAULT HISTORY. COMPLIED WITH OPERATIONAL TEST OF WING ANTI ICE CONTROL AND INDICATING SYSTEM. NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.