A service part Field Replacement Unit (FRU) is used to replace a defective part installed or attached to the computer. Service part FRUs are identified by a 7-digit number on the part itself (for example, FRU P/N 11x1111). A Lenovo FRU can be purchased and replaced by yourself or a Lenovo qualified field support person. Lenovo FRU01YP409 laptop reserve-onderdeel Toetsenbord