  A possible origin of the iron-deficiency in PG1159 stars could be neutron
captures on Fe nuclei. A nickel overabundance would corroborate this idea.
Consequently we are looking for nickel lines in PG1159 stars. Prime targets are
relatively cool objects, because Ni VI is the dominant ionisation stage and the
spectral lines of this ion are accessible with UV observations. We do not find
such lines in the coolest PG1159 star observed by FUSE (PG1707+427, Teff =
85,000 K) and conclude that the nickel abundance is not enhanced. Hence, the
Fe-deficiency in PG1159 stars remains unexplained. In addition, we present
results of a wind analysis of the hybrid-PG1159 star NGC 7094 and the
[WC]-PG1159 transition-type object Abell 78 in order to derive F abundances
from the F VI 1139.5 Angstrom line. In both cases, we find F overabundances, in
agreement with results of photospheric analyses of many PG1159 stars.
Surprisingly, we find indications for a very low O abundance in NGC 7094.
