The PTT unit onb my DF70 can be removed with the engine insitu.
It was a case of:
1. Fully tilt the engine
2. Support the engine with the tilt rests
3. Remove the bolts that go through the bottom from the sides
4. Remove the pin that goes through the top of the ram.
I had the same email saying time was running out fore rewnewal, although I'd paid on 7th Jan, turned out head office had sent hundreds of emails by mistake and their phones were red hot!