Grohe Parfield pullout sprayer. Fixable Leak - $40 (Portland)

Grohe PARKFIELD Single-lever sink mixer 1/2" with pull out sprayer.
MODEL # 30213 Plumber handyman’s dream Excellent condition.
Works BUT there is a leak somewhere In the guts.
Could be a hose or a gasket? Bought it brand new for $400 in 2019.
Good for plumbers to fix it and rese