  The bound-state QED approach is applied to calculations of the $2p_{3/2}
\rightarrow 2s$ transition energies in He-, Li-, and Be-like uranium. For
U$^{90+}$ and U$^{89+}$, standard perturbation theory for a single level is
employed, while the calculations of U$^{88+}$ have required its counterpart for
quasidegenerate levels. The utilized approach merges the rigorous QED treatment
up to the second order of perturbation theory with the higher-order
electron-correlation contributions evaluated within the Breit approximation.
The higher-order screened QED effects are estimated by means of the model-QED
operator. The nuclear recoil, nuclear polarization, and nuclear deformation
effects are taken into account as well. Along with the transition energies,
their pairwise differences are calculated. The comprehensive analysis of the
uncertainties due to uncalculated effects is carried out, and the most accurate
theoretical predictions, which are in perfect agreement with available
experimental data, are obtained.
