ignis adl347 dishwasher hose

hi guys
went out to customer yesterday reported that dishwasher was not completing programs. started program on quick wash , heated and emptied ok. tried another program started ok then opened door to check that everything ok. then problem started when i closed the door and wash started again loosing pressure to spray arms. removed front plinth to see that the 90 bend hose between heater and sump collapsing in on itself ? just need to replace hose? hose was ok at start of wash, heat affecting hose? has anybody had this problem before ? regards jon