What was found
ON TAKEOFF AT 60 KTS NR 1 & NR 2 BLEED HOT CAUTION LIGHT ILLUMINATED AND WE ABORTED THE T/O. INTERROGATED CDS, FOUND FAULT CODES 3001, 3101, R & R ENVIRONMENTAL CONTROL SYS ELECTRONIC UNIT CONTROL, IAW AMM TASKS 21-61-01-000-801, 21-61-01-400-801 GROUND RAN ACFT, OPS CHECK GOOD. BLEED HOT CAUTION LIGHT DID NOT RETURN, NO FAULTS LOGGED IN CDS, NO OTHER DEFECTS NOTED. ACFT RELEASED FOR CHECK FLIGHT, AND CHECK FLIGHT GOOD. RETURNED TO SERVICE.