I was once faced with a similar situation on a twin engined helicopter. Maintenance had told me they had done extensive diagnostic checks on one of its engines, which had thrown up repeated “chip” warnings on a previous flight. I was briefed by the duty engineering manager that they now suspected it to be a wiring fault causing spurious warnings because there had been no sign of any debris found on the detector and not to be unduly concerned if it recurred. They had carried out an oil drain and flush and extensive ground runs then it was put back on the line. Sure enough, during my flight it put up a chip light. As I was unable to divert anywhere for a single engined running landing I put it to idle and returned to base, bringing it up again a few minutes later for the landing.
I reported the chip light. Two days later I was issued with a formal written warning for not shutting the engine down because it had made a lot of metal in a very short time. The a$$#@/e duty engineering manager took very large steps backwards, refusing to back me up at all.
One of life’s lessons learned.