What is the purpose of these caps?

I have one of the earlier versions of the ShortestWay 51+ amp (also referred to as the SW51 amp). This amp was created by a SBAF community member. It's a SET amp that uses 6Z51P/EF184 tubes.

I had a look at the PCB and was wondering if someone could tell me can what the purpose of these 2 film caps were:



The caps are WEIDY W313A102-J6:
  • Capacitance is 0.0010 uF / 1000 pF
  • Voltage rating of 1000/1250 Vdc

Thanks in advance.
 
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I unfortunately don't have the schematic. I reached out to the owner but haven't heard back from him for a long time. Based on some of the threads on SBAF, the SW51 amp was built around the design of the Eddie Current ZDT Jr. - not sure if that helps