What was found
CREW ATTEMPTED APU START - FAULT LIGHT ILLUMINATED. INTERROGATED CDU FOUND FAULT CODE 49-41011 <NO FLAME SHUT DOWN>. GROUNDED - YES. ACCOMPLISHED APU BITE PER FIM 49-60 TASK 801. CURRENT STATUS SHOWS FAULT 49-94304 OIL LEVEL SENSOR FAULTY. ALSO FOUND FAULT CODE 49-41011. PERFORMED FIM 49-40 TASK 802. PRECAUTIONARY REPLACE ECU. RMVD AND INSTALLED NEW ECU. REF AMM 49-61-12-400-801. VERIFIED SOFTWARE WITH IPC 49-61-12-01. PERFORMED APU STARTING AND OPERATION, AMM TASK 49-11-00-860-801 AND APU BITE PROCEDURE, AMM TASK 49-61-00-700-801. SYS CKS NML. CURRENT STATUS IS CLEAR. CLEARS MEL 49-1B.