aeg dishwasher not heating

Hi Guys,

Had a look at a slimline AEG dishwasher today (911788030/02).
Worked out after a little while: It only heats to luke-warm.

Metered heating element fine. Thought it must be the normal relay pcb problem, however the pcb looked A1, no dry joints. Followed one of the wires from element to a pressure switch. A couple of questions;

All my successful pcb 5-pin relay swaps have been obvious heat damage.
Do the newer boards fail without obvious burning?

Can a fault pressure switch cause no heat? I have the c/diagram but it is not clear if there are one or two pressure switches?

Cheers
Graeme