I'm not sure what you've been told. Yes, of course calibrators are like all electronics - they don't live forever. But as long as you treat it right you'll get quite a few good years out of it.
For this one, it should be sufficient to add a Solid Color layer of appropriate blue colour, and set that layer's blend mode to "Color", then gently mask it on to the problem areas.
You're having a run of bad luck. Fine detail like clothing fabric makes it happen.
Ah, I see the problem. Your Properties panel is too small, so you can't see the fourth field.
I've given you four numbers, which you have to put in the four fields, in the order given. 0 in the first field.
Hi Monique, I think this will work for you ...
A Channel Mixer adjustment layer, with these values:
Red 0, +101, 0, -2
Green 0, +97, 0, +1
Blue 0, +95, 0, -2
Make sure you get the numbers in exactly the right order.
Please ignore all phones. Phone screens are deliberately manufactured too bright. ONLY assess your editing screen based on pro lab prints.
https://www.damiensymonds.net/2010/09/all-about-monitor-calibration.html