Diana Diana 430l TO6 trigger spring breaking?

I sold my Diana 430l to my brother in law. He likes the gun but the sear spring, in the TO6 trigger, has broken twice. He was able to order 2 spare springs and a complete trigger unit from PA. He had one of the spares break, installed complete TO6 trigger and after shooting a while, spring broke. PA said not selling any more springs or triggers. Anyone run into this with the TO6 trigger. If the last spring breaks, he is sol unless a fix or new trigger can be found. Any help would be greatly appreciated. Don
 
I sold my Diana 430l to my brother in law. He likes the gun but the sear spring, in the TO6 trigger, has broken twice. He was able to order 2 spare springs and a complete trigger unit from PA. He had one of the spares break, installed complete TO6 trigger and after shooting a while, spring broke. PA said not selling any more springs or triggers. Anyone run into this with the TO6 trigger. If the last spring breaks, he is sol unless a fix or new trigger can be found. Any help would be greatly appreciated. Don
I don’t have one of these rifles but if I did and this was happening, I would try and figure out what is causing the spring to break. Look for clues such as wear marks on any parts or interference with some part. Not knowing how or where the spring is breaking it’s hard to say, but something should be noticeable, that’s my advice.