Discussion about the Korg PolySix synthesizer

Greetings to all. My name is Jim and I'm new to this group. First, I 
want to thank everyone whose info and replies I have been reading 
here in Polysix land. You people are a godsend and are very familiar 
with this particular beast and I thank you for all of your ideas for 
the repair of my Polysix (Old Crow, you especially!). This really is 
the information age at its best! As for me, I am a "munician"- in 
other words, I am a musician/technician, and over all gadget freak. 
For some reason, over the last few years I have been relentlessly 
collecting synthesizers and keyboards, but that's another topic all 
together.  And now on to my repair problem...
I bought a Polysix off of eBay which is in very good condition except 
for a few dings to the wood sides. This unit was non-functional when 
it arrived due to the battery corrosion problem. The strange thing is 
that the battery didn't leave a puddle of corrosion under it, it just 
caused many, many of the via holes and traces covered with dull 
grainy appearance. This occurred over at least half of the component 
side of the board (the battery still looks fine and works). So, I had 
to repair a bunch of traces with jumper wire and also used my 
conductive pen (try it!), after which time all of the funtions of the 
keyboard now operate with the exception of ONE ANNOYING THING- no 
memory funcion. In other words, when I tweak a patch the way I want 
it and then store it it vanishes when I change banks and then go back 
to it. Also, when I load a tape dump in it accepts it, but does not 
appear in memory. I traced this down to a corroded +5 volt supply pin 
on IC 32. When I repaired this problem it still wouldn't work. Plus, 
when shut off the circuit draws about 3/4 of an Amp from the battery- 
enough to kill any back-up battery quickly. When I disconnected the 
+5 to the memory chip, the current draw problem goes away. Plus, I 
checked IC 25 gate chip, and it works fine. The only thing that can 
cause this, in my mind, is a faulty TC5514APL-3 SRAM. DOES ANYONE 
KNOW WHERE I CAN GET ONE OF THESE CHIPS? Are there any substitutes? 
All you techies out there, please help! Thanks for reading this very 
long post. Take care! ~JIM