As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE "DUAL BLEED" LIGHT ILLUMINATED OUT OF 13000'. FLICKERED ON & OFF. ON FINAL APPROACH REMAINED ILLUMINATED UNTIL REACHING THE GATE. MASTER CAUTION FLICKERED BUT RT SIX PACK DID NOT ILLUMINATE. FOLLOWED FIM 49 51 TASK 801. REPLACED BLEED AIR VALVE. ACCOMPLISHED BITE OF CDU CONFIRMED CURRENT STATUS "NO MAINT MSGS FAULTS".