95 Ford Taurus grinding sound... HELP...

Hello, Recently purchased this used 95 Fort Taurus. Firestone replaced some gasket this last saturday in their transmission service they said would fix transmission fluid leak. Today there was some grinding(i
think) sound from under the front passenger side seat just twice. What could be the possible reason? Will be taking it to Firestone if it repeats tomorrow...
THank you, regards, PRasad
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MK opined in

While you were driving? While you were turning a corner? As you started it? After you shut it off? As you opened the door to get in? As you walked away? Just before you noticed the cat was missing?
... just a thought... is that passenger side seat a power seat?
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