Look higher up
A cracked slate, leaking gutter joint, damaged felt or valley can send water to the eaves. Old underlay sometimes sags behind the fascia and holds water like a shallow concealed gutter.
Check rafter ends
Once the fascia is open, look at the timber behind it. Surface staining is different from soft structural timber. If decay extends into rafter ends, the scope of work changes.
Capping is not a repair for wet timber
UPVC can be useful, but covering rotten timber without dealing with water ingress simply hides it. The roof edge still needs a proper route into the gutter.
Refit the gutter carefully
New fascia work can alter bracket levels. After the repair, the gutter should still sit correctly beneath the roof edge and fall towards the outlet.
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Describe what you have noticed and, if you can, include when it happens and which part of the roof seems involved.
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