I'd guess "EL", but I could be wrong.
http://www.nicoclub.com/FSM/240sx/1991-1994_general/
And 200k is a lot for an automatic.
The most common failures are:
1. Clutches could have just finally wore out
2. Something got overheated and either something got burned, or it changed the resistance of the solenoids so much they didn't put out the right pressure.
3. The solenoid spool valves wore out, causing excessive leakage (internal), leading to slippage, leading to blown clutches
4. Internal piston seals failed, resulting in not enough pressure on the clutches, leading to blown clutches
During a rebuild, they typically replace ALL of those things (clutches & steels, solenoids, piston seals, sometimes even springs if they are known failurepoints). It is highly labor intensive, and often requires special tools.