What was found
DURING DESCENT, NR 1 ENGINE FAIL & SOURCE OFF LIGHT ILLUMINATED, N2 OBSERVED TO DECREASE BELOW 35, AUTO-RELIGHT SUCCESSFUL AS ENGINE ACCELERATED TO IDLE BEFORE QRH SHUTDOWN PROCEDURE COULD BE COMPLETED, AFTER LANDING NR 1 ENGINE CONTROL LIGHT ILLUMINATED. ACFT GROUNDED. MULTIPLE TSRS ISSUED. REPLACED NR 1 EEC 73-21-60-400. OPS CHECKED GOOD IAW FADEC SYS TEST IAW AMM 73-21-700-802. REPLACED FLIGHT DATA RECORDER IAW AMM 31-31-11-400. OPS CK GOOD IAW SAME AMM. REPLACED NR 1 ENG HMU IAW T/C N8473000 AND N8473001. FOUND NR 1 HMU FUEL SUPPLY TUBE CHAFED. REPLACED FUEL TUBE REF AMM 73-11-01-400-801-F00, SUBTASK 73-11-01-420-007-F00. REMOVED AND INSPECTED NR 1 ENG 5TH STAGE BLEED AIR CHECK VALVE, REF 36-11-02. CHK VALVE IS GOOD IAW AMM 36-11-02-200-801. REINSTALLED CHK VALVE IAW AMM 36-11-02-400-801. REPLACED NR 1 ENG TRANSIENT BLEED VALVE IAW AMM 75-23-01. IDLE POWER LEAK CHECK AND ACTUATOR TEST NORMAL IAW AMM 71-00-00. 5TH STAGE BLEED AIR CHECK VALVE LEAK CHECK GOOD. C/W FIM TASK 73-05 TASK 805 E(11) FUEL SHUT OFF VALVE TEST REF AMM 28-22-00-720-801. TEST PASSED. C/W FIM 73-05 TASK 805 E(8). CHECKED FUEL FILTER - NO CONTAMINATION. REPLACED FUEL FILTER REF 73-11-06-400-801-F00. ALL VSV HARDWARE CKS GOOD. C/W TEST 12 ACTUATION TEST REF 71-00-00-700-802. VSV OPERATES SMOOTHLY. ACCOMP TEST 3A - IDLE POWER LEAK CK REF POWER PLANT TEST REF AMM 71-00-00-800-811-F00. TEST 3A IAW AMM 71-00-00-700-801-F00. NO LEAKS NOTED. ACCOMP TEST IAW ASSURANCE CK REF 71-00-00-400-813, NR 1 ENG CK GOOD.