I'm not sure ZLC has a frequency of 133.55. ZLA uses that frequency. Could there be a ZLA feed that has that frequency archived?
We were over Utah approaching Nevada and I wrote the freq and time down, so I know that is correct. That is a bummer! My controller friend said "You could get a copy using the FOIA route. Hopefully someone at the facility will copy it and make it viral."
Wouldn't know where to start with that.