As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE-OFF NR 2 BLEED HOT CAUTION ILLUMINATED. CAUTION LIGHT WAS RESET VIA E&A CHECKLIST BUT RE-ILLUMINATED. BLEED HOT CAUTION NOT ILLUMINATED WITH BLEED SELECTED OFF. BLEED FLOW WAS SELECTED TO MIN FOR APPROPRIATE TIME FRAME PRIOR TO DEPARTURE (BLEED SYSTEM). REMOVED FROM SERVICE. ECS ECU REMOVAL AND REPLACEMENT. PERFORMED OPERATIONAL TEST OF THE BLEED AIR SYSTEM AS PER AMM TASK 36-11-00-710-802. NO BLEED HOT CAUTIONS ILLUMINATED AT ANY TIME. AIRCRAFT RETURNED TO SERVICE.