8770 error code 334 and 314?

When I try to engage my pto on my 8770 I get the error codes 334 and 314. I put a new switch in and that lasted about 2 loads with my manure spreader and then it kicked out those two codes again. When I shut the tractor off and restart it and then try to engage the pto the codes come up immediately. Any help or ideas would be great, thanks.