Hey, I FINALLY remembered to tune in and try to hear one of these LRA36 tests!
Listening via the CX8BIT SDR in Montevideo, Uruguay, and as of 2023 UTC, I'm hearing Spanish ballad music, fair at the peaks but fading in and out somewhat on 15475.90 USB.
2034 UTC: Somewhat faster-paced song in Spanish, possibly after a bit of talking that was all but inaudible.
2040 UTC: Now listening via SDR in Sao Bernardo do Campo, Brazil. Reception's about the same: weak, but fair at the peaks, with lots of music.
No sign of the signal directly here near Seattle, obviously.
UPDATE: I posted a minute of video from the LRA36 broadcast:
https://www.youtube.com/watch?v=KEy_TT8RHrw