What exactly is the problem?
Inspection microscope/probe.
PON meter
Optical TDR
Light Source
Etc, etc.
I take it you are not trained/endorsed for fibre?
Most fibre faults (after test/certification) are mostly dirty connectors, but there's no way you can check/test without the necessary equipment.
You'll need an OF cleaner and scope to check.
If it's a fault somewhere else, you'll need an OTDR to locate the fault.
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