Each of plaintiff's excess liability insurers then contribute funds for similar costs until its aggregate limit is met.
Defendant is both a primary and excess liability insurer of plaintiff.
It further provides that the insurers would pay a pro rata share of a specific per file service fee to the Administrator in return for these processing tasks. The Agreement contains a Pennsylvania choice of law provision. The Agreement contains an integration clause and provides that no amendment or modification will be effective unless set forth in writing. Plaintiff did not respond. Plaintiff and defendant then engaged in negotiations about the service fee in December 1997, but did not agree on a new fee.