It broke when I installed KitKat and I am running on a recent CM11 build with the Boeffla kernel. My IMEI is correct but the serial number doesn't match the one under the battery so that might be related.
My baseband is I9300XXLE8. I have no idea if I need to upgrade that but all the ones I can find are for 4.1 or 4.2.
Any ideas how to get the indicator bars displaying correctly?