What was found
AIRCRAFT WAS REMOVED FROM SERVICE NOVEMBER, 1995, FOR RESTORATION. ELT EXPIRATION DATE WAS FEBRUARY, 1996. DECIDED TO C/W FAR 91.207(D). DISCOVERED THIS UNIT IS SEALED, AND THERE IS NO WAY TO INSPECT BATTERIES. THE BATTERIES WERE ABOUT 3 MONTHS OVER EXPIRATION DATE, BUT BELIEVE THEY WERE BAD BEFORE THAT DATE. THERE IS NO WAY TO INSPECT THIS TYPE OF BATTERY. THERE WAS NO OUTSIDE INDICATION OF A LEAK. IF THE UNIT HAD BEEN WITHIN ITS EXPIRATION DATE AND HAD BEEN OPENED AND FOUND OK, THEN WOULD NOT HAVE BEEN ABLE TO PROPERLY RESEAL IT.