What was found
(CAN) PILOT REPORTS DURING DESCENT HE REVIEWED THE EICAS. HE SAW THE RT ENGINE OIL PRESSURE WAS INDICATING RED AND VERY LOW. HE PULLED THE POWER BACK ON THE RT ENGINE AND THE PRESSURE WENT AS LOW AT 10PSI. HE PUSHED THE POWER BACK UP AND THE OIL PRESSURE INCREASED TO THE MID 20S, BUT REMAINED RED. NO CAS MESSAGES POSTED DURING THIS EVENT. HE SHUTDOWN THE RT ENGINE AND FINISHED THE DESCENT, APPROACH, AND LANDING ON (1) ENGINE WITHOUT FURTHER ISSUES. ONCE AT THE FBO, THE PILOT INTERROGATED THE MDC AND FOUND THE CURRENT FAULT MESSAGE: ATA 71-00 POWERPLANT RT ENGINE OIL PRESSURE FAILED/WIRING OIL PRESSURE SENSOR 1A. B3-303646, MCID 1001.