The 0.25 Hz bandwidth coherence results between H1 and L1 as generated by stochmon (see Fig. 9)
https://ldas-jobs.ligo.caltech.edu/~thomas.callister/stochmonO1/stochmon.html
are showing a new peak at 24.75 Hz to 25.0 Hz.
The 0.1 Hz coherence results (Fig. 11) show finer structure with peaks at
24.9, 25.0 and 25.5 Hz.
Those coherence plots are also posted below.

Pat Meyers ran STAMP-PEM for H1 and L1 around these frequencies. For H1
https://ldas-jobs.ligo-wa.caltech.edu/~meyers/stamppem/results/HTML/11325/H1-GDS-CALIB_STRAIN-HTML-1132574417-3600-245-255.html
There was coherence to be seen at these frequencies with
lots of PEM-CS accelerometers/mics and then getting into the suspensions.

The STAMP-PEM results at L1 did not show anything interesting at these frequencies.
https://ldas-jobs.ligo-la.caltech.edu/~meyers/stamppem/results/HTML/11325/L1-GDS-CALIB_STRAIN-HTML-1132577658-359-245-255.html

Nathaniel Strauss ran the coherence tool over the data for the more recent O1 week using 1 mHz resolution. The full set of coherence tool results for the last O1 week for H1 can be found here:
https://ldas-jobs.ligo-wa.caltech.edu/~eric.coughlin/O1/LineSearch/H1_COH_1131753615_1132358415_SHORT_1_webpage/
Nathaniel found much structure in this 25 Hz region in tons of channels. His summary is here:
https://ldas-jobs.ligo-wa.caltech.edu/~nchriste/O1/noise_lines/25Hz/Lines_at_24-25_Hz.pdf

Keith Riles has speculated that for this observed H1-L1 coherence an H1 line at 24.9 Hz is getting tangled up with the L1 line at 24.82 Hz. He also notes that there are plentiful 1-Hz combs in both IFOs with various offsets from zero, including lines that appear at about 24.5 and 25.0 Hz. I am also posting spectrums that Keith made from H1 and L1 in that band from the first week of O1

Nelson, Nathaniel, Pat, Keith