Is yours a DIY kit? If so, you can replace station 5 triac: the part number is MAC97, which you can easily find on digikey or mouser. You can also send an email to [email protected] and we can send you a couple.
To replace the triac, my suggestion is: so long as you can access the legs of the existing triac, you should use a diagonal cutter to carefully clip off the existing one, then desolder the residue legs, and solder the new one. If this is not possible, use a desolder pump.