As you've had it at most 2 1/2 years, then PCS may well offer to replace it if it has become faulty, although may depend on what warranty you selected.
#PLS help I need new RAM
quartz karma
normal rune
Its always better to have two RAM sticks over one though if not still under warranty
quartz karma
I would phone PCS up about it as, while it may not be covered by PCS's warranty, Corsair DRAM modules come with a lifetime warranty (according to the Corsair website) so PCS may replace it under that or maybe tell you the best way to get Corsair to replace them. Definitely better than spending £200+ on them https://help.corsair.com/hc/en-us/articles/360033067832-Warranty-Corsair-Limited-Warranty
Incidentally, what troubleshooting have you done to determine that it's definitely a RAM issue? I only ask as PCS may ask what you have done and might be useful to make sure there's nothing you have missed (saves time when you are contacting them)
oblique tiger
Thanks for your help guys I appreciate it. I’ll get in touch with both pc specialist and Corsair