These are gas turbines (from an earlier comment).
Yes, that is understood. Still, the problem is insufficient cooling capacity (or poor maintenance of the existing heat exchangers). Tedious job that, cleaning heat exchangers.
In gas turbines, the principal cooling functions are turbine blade cooling and lube oil cooling. LO cooling is by standard heat exchangers, and blade cooling by bleed air from the compressor. Usually the bleed air temperature can be reduced by interstage heat exchangers. Fitting additional units is not possible, but a more efficient unit might help. Inlet air coolers would also help, assuming there is space for them.
The RR turbines and the GE turbines are both aero-derivative
plants, mainly designed for running in low ambient temperatures. I wonder ..... does the USN experience the same problem with their GE units?