The RR250 is a modular engine with uneven life limits/overhaul times. If we look at the TCDS for the RR250-C300, this engine is a C-20 from the compressor on back. Accordingly, if the #1 and #2 wheels are PN 23073853 and 23073854, then they have a finite life limit of 1775 hours and a cycle limit of 3000. (Not sure what the compressor times are for the 250-C300.) Big chunk o'change to replace the #1 and #2 wheels at 1775 hours.