Hi everyone, do you know where it might be possible to track down a log of CX flights showing which particular CX aircraft operated a particular route for a flight a very long time ago?

I keep a personal log of all my flights and one of the few gaps is the CX flight I took back in December 1990 from HKG - TPE. Added to this, it was my only ever L1011 flight that I ever took, so not having the registration is extra annoying! It was CX408 on 3 Dec 1990.

If anyone can help/refer me on, thank you in advance.