Red SRS dash warning light has recently been coming on for a little bit, then goes off, then on etc.

Perhaps a faulty sensor?

Car is '03 TL VRX.

Usually one of the airbag connectors under the front seats, my LH side plug is famous for my srs light show.
The fix, find the faulty plug (usually loose) refit and secure. I will use tape next time.
Seat covers were probably the cause of mine flogging out.

could also be a faulty clock spring

could also be a faulty clock spring

No, is a common problem on the TL/W seriers really
Ends up being one of the airbag connections under the seat
Mine came on the other day, moved the seat and it turned off hasnt come on since