What was found
FLT 771 AT 1000 FT, NOTICED NR 1 ENGINE N1 WAS BELOW NR 2 ENGINE N1 STABLE AIRCRAFT, APPROACH CONTINUED. NEARING 500 NR 1 ENGINE FAILED. CONTINUED & LANDED. SHUTDOWN ENG AND TAXIED TO GATE. REMOVED & REPLACED PMA IAW AMM TASK 73-22-38-000-010-B. OPS CHECKED OK, NO FAULTS NOTED.