42 Pa.C.S. § 7321.28

A motion under section 7321.6 (relating to application for judicial relief) must be made in the court of the county in which the agreement to arbitrate or section 7321.16(f) (relating to arbitration process) specifies the arbitration hearing is to be held or, if the hearing has been held, in the court of the county in which the hearing was held. Otherwise, the motion may be made in the court of the county in this Commonwealth as provided by the Pennsylvania Rules of Civil Procedure. All subsequent motions must be made in the court hearing the initial motion unless the court otherwise directs.