[Yaesu] FT-757 battery

[Bill Barr]

Hi all just bought a 757 at a hamfest for 100 bucks. the vfo shaft  
was frozen and i fixed that but the memory battery seems to have died  
cause it defaults to 7.000 when I turn it off and back on. Where is  
this battery located? Also I seem to have no transmit from 3.5-10.0  
but i figure for 100 bucks I can afford to put a little into it to  
repair it or just use it for 10.0-29.0. Any recommendations on a good  
tech to send this to if i cant figure out the transmit problem?

Thanks

Bill N4UAJ