What was found
(BIER) ELT REMOVED FOR INSP AND TESTING IAW CFR PART 91.207D. DURING BENCH TESTING OF ME-406 ELT, THE ELT WOULD NOT TURN OFF OR RESET. INTERNAL BATTERY HAD TO BE UNPLUGGED TO PREVENT ELT FROM REPEATED TRANSMITTION. ELT PN 453-6603, SN 14668 WAS SENT FOR NEEDED REPAIRS UNDER THEIR WO 34431, DATED 12/02/2010. RETURNED THE ELT WITH A COPY OF THE WORK ORDER AND FAA FORM 8130-3. RESULTS FORM COBHAM: COULD NOT DUPLICATE INDICATED PROBLEM. UPON RECEIPT OF THE ELT, INITIATED A TEST OF THE ME-406 ELT USING TESTER PN 453-1000, A TESTER RECOMMENDED BY MFG TO TEST THE MESSAGING FEATURE OF THE ME-406 IAW ME-406 MANUAL PARAGRAPH 4.4.10. ONCE AGAIN THE ELT ASSY WOULD NOT RESET AFTER TESTING THE "G" SWITCH. ELT HAS BEEN SENT AGAIN!