From David's americanradiohistory.com site's incredible archive of Billboard Magazine. June 21, 1975 edition---Rick Ward is GM at the time, they're Spanish during the day, rock and soul at night, and Rick says they're changing the call letters back to XERB (never happened). Two pages:
https://www.americanradiohistory.co...d 1975-06-21-OCR-Page-0022.pdf#search="xeprs"
https://www.americanradiohistory.co...d 1975-06-21-OCR-Page-0023.pdf#search="xeprs"
https://www.americanradiohistory.co...d 1975-06-21-OCR-Page-0022.pdf#search="xeprs"
https://www.americanradiohistory.co...d 1975-06-21-OCR-Page-0023.pdf#search="xeprs"