~!!??
WOW~!! Well, unless it's a limbic it's had plenty of time to straighten out.
Which of course raises the question: Has your brewery been infected with wild yeasts?
As an aside ( or not aside at all) There are wild yeasts that can survoce two ( count 'em ) Autoclave cycles.
Might I suggest that you clean you gear with a round house of sanitizers starting with
Purisan - peracetic acid sanitizer
Excel - highly alkaline circulation cleaner
BSR - acid for removing scale and buildup in tanks
I-O Safe - iodine-based sanitizer
Lustre - chlorinated caustic for cleaning
Use longer soaks than normal & a rinse in between.
Or in the absence of those try
2 gallons water with 1 ounce of vinegar and 1 ounce of chlorox (Chuck Talley says this should be 5 gallons)
Star San - mixed a little strong
Vinegar - straight from the bottle
Longer soaks & rinsing in between
And take a propane torch to all your welds and joints. Heat 'em up past 300F. No need to make 'em glow - that might be bad for the ChromeOxide layer.
As an aside:
You can restore the Chrome Oxide layer on SST with a citrus acid soak any temp any time any titration ( so long as it's strong). You can even use lemon juice straight from the bottle so long as you apply a little heat.