Given that the Jaguar is now retired from service in all other countries, except India, it would not be possible to keep them in service without MIDHANI, HAL and other suppliers and agencies working on indigenising parts of the engine as well as most of the other LRUs. Already more than 70% of the Jaguar was indigenous when HAL was building them. That content has only gone up now.
As it is, the Jaguar DARIN 3 is so different compared to what any other Jaguar ever was, that it was obvious that almost all of the Jaguar parts are either indigenous or a suitable imported alternative exists.
Keep in mind, the Jaguar DARIN 3 is an AESA radar equipped strike fighter with ASRAAM, SAAW, LGBs, 1000 lb CBU-105 Sensor Fused Cluster bomb, Harpoon AShM, HSLD bombs, etc. Basically the Jaguar has sharp teeth and claws but now it's eyes and ears have been seriously upgraded.
Read this interesting report on the IAF successfully testing the CBU-105 Sensor Fused Cluster Munition from a Jaguar at the Pokhran range. India ordered over 500 of these cluster bombs for the Jaguar fleet.
IAF tests CBU-105 anti tank smart bomb