DA40 nose gear elastomeric assy upper bolt to engine frame working loose where rod end attaches, worst case bent tie bolt through firewall.
DA42 fuel selector valves, due to fuel system design, i.e. no filter before selector. Excessive rotational torque noticed in fuel selector or pilot reporting high fuel temps in one tank caused by fuel selector not indenting correctly and returning hot fuel to other tank - replace selector, to check condition contact Andair who manufacture selector, of the top of my head the maximum upper design torque is about 1.8 Nm