[Elecraft] K3 CW power higher than tune power pse help

[Klaus Koppendorfer]

Since few weeks i saw that k3 power goes up more than 100 watts
So I did new wmtr-hp calibration compare with my LP100A
The value for wmtr-hp has to set up to 160  for 50 Watts cal with "tune"
When I use cw the  power goes from 50 watts up to 65 watts
I can read this power difference with lp100a on k3 rf-bars and also on kpa500 power-leds

Has anyone an idea what could have gone wrong in my k3
What can I measure inside on swr-bridge ??

73
Klaus
OE6KYG
KX1 #244
K1 #2135
K2 #1331
KX3 #462
K3 #115
P3 #469
KPA500 #94
KAT500