EGNOS/ESTB - Obtaining a different sat on a Garmin Legend

I had WASS/EGNOS capability turned off while the ESTB was transmitting
on PRN 131 (44) as it was difficult to get a fix in the UK. However
since the ESTB has moved back in range to PRN 120 (33) I thought I
would switch it on again.... except that instead of finding 33 it
picked up the other two EGNOS satellites 124 (37) and 126 (39) which
as far as I can tell are not giving me any correction data as there
are no "D"'s appearing on the other satellite signal bars. Presumably
I need to be able to see PRN 120 (33) to get correction working until
the full switch to EGNOS. Is there a way to force the Garmin Legend to
ignore 39 and reacquire 33? I tried a hard reset to factory defaults,
reacquired the basic data with "WASS" turned off and then turned
"WASS" back on again but I immediately got 37 & 39 showing again (no
scrolling through the numbers) suggesting that not all of the data was
cleared from the unit on resetting.

Andy Robinson
.