134.05 appears to be a secondary tower frequency for KEWR and 126.15 is a secondary ground frequency. It seems to me to make more sense for them to switch over to the secondary ground frequency and not the secondary tower frequency. But at this point 126.15 does not appear to be covered by a LiveATC feed; it may have been available in the past but I don't know for sure.
Do you have an information on what flight this was?
Thanks, Ron