The yellow mucous is likely what he vomited from his stomach, not the lungs, and is not significant if it is not repeated. If the cat is not coughing, there is probably no fluid in the lungs, but in the chest cavity around the lungs. If this is pinkish, slightly cloudy, it could be lymph or chyle, due to a tear in the Ductus arteriosus, which brings lymph back to the heart. Other possibilities are infections outside the lungs (pleuritis) and exudates or transudates in the thorax, possibly due to a tumor or growth within the chest cavity. This fluid should be sent to a pathology lab to determine its origin.

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