Hey clicio, i don't know if you have watched any of Renato Bocabello's lives, but currently it appears to be happening a really big infestation of borers in São Paulo. I would not repot right now if i were in your shoes, our climate is very different from the rest of the world, a summer repot may be the final nail in the coffin of this poor juniper. I would apply imidacloprid, that will kill any borers and protect it from future infestation. soil drench together with foliar application. It's kind of hard to get it in brazil, you need to have cadpro (cadastro de produtor rural), but there are some sites you can buy from, if you can't get any send me a PM and i can send you some. I live in Parana and i also had some problems that has been solved since i started using imidacloprid.
Also where did you get that juniper? from kojima?