just bought a 425 serial # 46k w/875hrs and having a problem with the pto. at first pto would shut off after it ran awile, now it will shut off right after engagement. After a few attemts it may run for awhile complicating diagnosis. Cleaned all connections at seat sw,brk sw,relay board, pto, and eng ground. jumpered seat and brk switches for testing w/same result. powered up pto solenoid by jumpering the 2 blue wires at the pto sw to verify solenoid is ok and it did not shut off. When it does shut off, i will lose the red led lamp so im assuming that the pto relay coil is losing supply voltage. The pto relay gets supplied through the pto sw but thats where i get lost. im leaning towards a pto switch, but would like to verify before i replace a good part.I lose supply at both cir755 and one of the other blue wires at pto sw and the other blue wire stays hot which is the one that i used to jump. does anyone have any ideas what else to ck?