Hahsgrohe Interaktiv Variable Spread Lavatory Faucet. 1901 06609XX0 with 1901 4" Centerset Faucet 06608XX0. After years of trouble free use it has developed a drip. After disassemble of value there is no obvious washer to replace (as in old style valves). Appears to be an issue only corrected by value replacement - is this the only course of action?

Plumbing - Hansgrohe - - Lavatory Faucet - Centerset - Retroaktiv Tango - 06430000