DAC+DSP suddenly has no output

I have a DAC+DSP that I recently got set up correctly on a RPI 4 with raspberry pi OS. 

I had two raspotify services set up, one to play audio out to a USB dac (and speakers) and one to the hifiberry and a headphone amp.
Today the headphones stopped outputting sound. To troubleshoot I disconnected the RPI and brought it back to my test bench, where I can confirm I get no sound from the RCA out, even when playing directly with mplay.

Aplay output still looks normal

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberrydacplusdsp_sou], device 0: Hifiberry DAC+DSP SoundCard HiFi dacplusdsp-hifi-0 [Hifiberry DAC+DSP SoundCard HiFi dacplusdsp-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I also tried running toslink in, which I believe used to get forwarded to the RCA out, even when I was struggling to get the DSP set up. No sound.

I also noticed that the toslink out no longer shines red.
Is some part of the card dead? Is there anyway to check the cards' status beyond seeing if it shows up in aplay?


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