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The opener (if it is overhead) should be checked for any oil leakage. Normally it would not happen, and so if it happens it must be remedied, or the garage door opener motor may overheat and burn out.
It also occurs to me that, if this were a prank, careful tracing back (e.g. by wiping places with a clean spot on a rag cloth, and seeing if it comes away oily) might reveal that the oil comes from... nowhere! but that's just a though on the side.
Also, the same, if someone overly-much lubricated the track and/or other parts of it, in an effort to stop squeaking or binding or noises when operated.
Is your opener the type with a chain drive, or another type of drive?
(Additional: the leakage of oil out of a failed capacitor in the opener, has been commonly reported about some Genie garage door openers. Whether in the quantity you report... that may be another matter! that capacitor is within / inside the opener itself, so you should be able to trace it back there.)
(Here's the capacitor of which this was reported.... maybe not for your exact model, though, and not recommended thereby as a replacement: