Attempting to publish a Presentation API WD - spec-generator times out?

Hello,

I am attempting to publish a working draft of the Presentation API [1]
using the ECHIDNA workflow documented here [2].  Everything seems to work
until the spec is passed through the spec-generator server, which times out
and gives me no further information [3] as to what the problem might be.

Can anyone with more access to the spec-generator output provide some clues?

Is there a simple way to run a ReSpec generated spec through the PubRules
checker to see if the problem is with the spec itself?   It appears I would
need to host the output on my own webserver and pass its URL to the checker.

Thanks!
m.

[1] https://github.com/w3c/presentation-api/tree/TR
[2]
https://www.w3.org/wiki/Second_Screen/Work_Mode#Publication_as_Working_Draft
[3]
https://lists.w3.org/Archives/Public/public-tr-notifications/2015Oct/0037.html