🛡️ Certified Examination Rigor: Christopher Gross holds the Registered Piano Technician (RPT) credential from the Piano Technicians Guild. To attain this credential, the practitioner completed and passed standardized written theory, aural concert tuning, and practical grand/vertical action regulation examinations.
RPT serving North King and Snohomish counties. Technical expertise in upright action restoration, grand damper alignment, and comprehensive acoustic rebuilding.
Seattle Piano Technicians Guild Directory (seattleptg.org). Record audited October 2026.