Alex, in perusing this and your other threads, I'm not sure if I saw whether your TX200 is fairly new or fairly old, or whether you bought it used or new. I, too, bought a new TX about three months ago, and have at least 1500-2000 rounds thru it, and I haven't seen too many...or any, for that matter...broken springs in TX200's reported on the forums. Not to say it won't or can't happen. Is the broken spring an OEM item or was it an aftermarket part?
Good luck on your quest. I know if I encountered a similar issue on my TX, I would really consider a professional tune, since that particular rifle is worth the extra investment! And there's one particular tuner who would get the nod due to his proximity to me, his obvious knowledge, choice of parts manufacturer, and willingness to share his knowledge on this forum! I might be willing to work on some of my lesser air rifles, but the TX? Probably not...the thing is a jewel.