For that year and model the 5AEQ27F is the correct preamp.
The only reason you would need to replace the pickup too is if that is also not working...I may suggest taking it somewhere and having it tested...
Does the preamp turn on and is just not getting a read? (Pickup may be bad, output jack may be bad)
or is the preamp not turning on, but when it does it works? (Preamp is bad)
the problem is it could be any of three components depending
5AEQ27F - Preamp - not turning on, even with new battery
5APU10F - Pickup - only needed if not responding to string vibration...You can only really test this if the preamp is working. Remove the saddle, Plug the instrument in and tap the pickup lightly with something metal, you will hear a noise through the amp if both the preamp and pickup are working.
5AJK05F - Output Jack - if Preamp is coming on, but yet no sound - this is what you would check first as it has the least cost to it.
as for ordering the preamp.
All of our parts come from overseas...an item like this isn't ordered often so we stock less...
I'm showing 1 to be available after the 2/13 delivery (subject to change) and several more coming in over March.
You can order directly from us (800) 669 - 4226 with Valid Credit Card number
or from any Authorized Ibanez Dealer, should they be willing to order the part for you.
Again I do suggest taking to a shop and getting a diagnosis, It could be something simple. Shops have ways to independantly test components, This may prevent you from spending more than you need to.
Thanks