As the tittle says is anyone kind enough to tell me (and help build a data base here) exactly everything I need to do a proper R134a conversion ?

So far, last year I had the compressor and the drier replaced (I think they have put new seals) and even if I use my AC only maybe 15-20 times last year, at spring time, I had no more gas in it, leaked by a seal, I went to refil the system but after that the AC doesn't work anymore : when I start the AC, I now got the 'red dot' instead of the 'ninja blue star' after a few minutes on the screen.

Thanks

Eric