Clean and put a piece of tape on crack and ride some potholes to see if tape has broken under creak.
Hmm like the idea of putting some tape there and seeing if it tears. Have you tried that before?
@mk1mark yeh good suggestion. I may do, although I'm happy to just wait for now and avoid disrupting the paint if I can.
@MCamb started
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Clean and put a piece of tape on crack and ride some potholes to see if tape has broken under creak.