From the Report to the Commissioner of Baseball of an Independent Investigation into the Illegal Use of Steroids and Other Performance Enhancing Substances by Players in Major League Baseball by George J. Mitchell, here are the references to the Phillies:
Former Expos catcher Luis Perez said that he could obtain steroids from a clubhouse attendant for the Phillies, from page 101:
[Luis Perez] said that he knew of clubhouse employees with other teams who were similarly called upon to obtain drugs for players, including in particular a visiting clubhouse attendant in Philadelphia.
Jeff Cooper’s concern of Lenny Dykstra’s apparent steroid use, from page 68:
Philadelphia’s then-head athletic trainer Jeff Cooper told us that during this period he observed a Phillies player whose use of steroids was “obvious.” Cooper would not divulge the player’s identity to us. He told us that he approached the general manager [Lee Thomas] to report his concerns, and the general manager advised Cooper that he should raise the subject with the player directly. Cooper then did raise the issue with the player, who said it was none of Cooper’s business. The matter went no further.