Will it include N0.1 BARS Radar being replaced with AESA Radar, secondly IAF will be retaining the Israeli Jammer in the tail. Any possibility of replacement of AL-31FN engines?
I am Not Very sure with regards to changes in the Engines for the SU-30 MKI Aircrafts.
(Picture of an AL-31-FP Engine)
Now with regards to changes in the Radar, the SU-30 MKI will have its current BARS Radar be replaced by our upcoming Indigenous Radar known as UTTAM AESA RADAR.
With regards to jammers, indian airforce may most probably retain them considering how effective this Jammers are, these Israeli ELM Elta Jammers showed how Capable and Effective they truly are by helping one SU-30 MKI(Callsign Avenger 1) dodge 4-5 AMRAAMS fired by your F-16s, or we could use DRDO Developed self Protection Jamming Pods(this answer with regards to Jammer could be wrong because you have asked Specifically Tail Jammers) rest everything is correct.