What was found
3B FAIL MSG PRESENTED DURING THE DESCENT. DECLARED AN EMER, REPEAT WRITE UP. ACCOMPLISHED WORK SCOPE IAW INSTRUCTIONS & REPLACED EIVM MODULE IAW AMM OPERATIONAL CHECK GOOD. CANNOT DUPLICATE FAIL. REMOVED MAU 3 POWER SUPPLY 2 & INSTALLED INTO MAU 1 POWER SUPPLY 1 POSITION & REMOVED MAU 1 POWER SUPPLY 1 & INSTALLED INTO MAU 3 POWER SUPPLY 2 POSITION. WORK PERFORMED IAW AMM 31-41-02. OPERATIONS CHECKED GOOD. MAU 3 PS2 PN 7024440-1903, SN 1508U310 INSTALLED & MAU 1 PS1 PN 7024440-1903 & SN 07078388 INSTALLED. REMOVED MAU 3 NIC 2 & INSTALLED INTO MAU 1 NIC 2 POSITION & REMOVED MAU 1 NIC 2 & INSTALLED INTO MAU 3 NIC 2 POSITION. WORK PERFORMED IAW AMM 31-41-04 OPERATIONAL CHECKED GOOD. MAU 3 NIC 2 PN 7038231-1902, SN 1509D623 OFF & PN 7038231-1902, SN 1510E024 ON. MAU 1 NIC 2 PN 7038231-1902, SN 1510E024 OFF & PN 7038231-1902, SN 150D623 ON. PREFORMED WIRING INSPECTION AS REQUESTED IAW SWPM 20-62-00, NO DISCREPANCIES NOTED. R & R EVM MODULE IAW MM 77-31-01. OPERATIONS CHECKED GOOD.