Thanks RW B2
The FCU was replaced last year before we bought the aircraft. I've spoken to pilots who flew the machine immediately before and after this replacement and they claim the starts did improve afterwards for a short period of time, but soon went back to as they were before.
Injector manifolds and OH starter have made no difference.
I'm not aware of any work being done on the P3 air feed, other than the AD that was issued in the Summer to check clearance between the first section of the air pipe and the RH rear half wall. I'll check with the technicians, but how would this cause the intermittent problem?
TTB