Technician A is right because oil accumulation in the air cleaner may indicate the PCV valve or hose is restricted.
The PCV is an acronym for "Positive Crankcase Ventilation" system which is the system that holds the engine oil of the car and is located at the base of the engine.
When the PCV system if faulty the following of bound to occur:
Therefore, Technician A is right because oil accumulation in the air cleaner may indicate the PCV valve or hose is restricted.
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