[Elecraft] Trouble with XV144

[luc]

Good afternoon
I get trouble taking my new XV144 into operation (with K2 S/N 4546, S/W
2.04P).
1. 40/60 m function : OK
2. Transverter function : I cannot get full milliwatt power. Holding TUNE
with a 50 ohm load across the XVR-OUT, the display reads a power range from
0.1 mW to 0.17 mW and then does'nt increase further. The bargraph displays
low power as well ( 2 bars). Keying the transmitter in CW mode, the display
is OK, but the bargraph has the same behavior.
I verified all what is possible to verify (diodes, R, C etc) but didn't find
anything wrong.

Any ideas ?
Thanks for your possible help.
73
Luc/F6HJO/HB9ABB