Hi, we have 35 MW Frame 6B. Currently, we have 3 ea (2 continuous running, 1 standby) exhaust frame motor blowers (88TK-1,2,3). 88TK-1 and 88TK-2 are placed in the same enclosure. We are monitoring each motor's current and voltage as our predictive maintenance program. On February 2022, 88TK-1 current is 27.28A and 88TK-2 current is 27.38A. In my understanding, it means that each motor runs at 50% of its capacity because the FLA is around 52A. But on March 2022, suddenly the 88TK-1 current decreased to 20.76A and the 88TK-2 current increased to 34.8A. What are the possible causes of these current drastic changes for 88TK-1 and 88TK-2? All check valves, bearing, vibrations, and housing temperatures are in normal condition. There is also no unbalance in current and voltage for each motor. Thank you.