English to Czech Tech/Engineering Energy / Power Generation Turbines

Thank you all for helping me out!

Context:
At (time), all operating indicators registered normal, but two seconds later, *finger pinned* blade attachments located on the next to last
row, known as the L-1 row, of the low pressure turbine failed. This led to
Sherco 3’s turbine and generator instrumentation reporting vibration levels
significantly above normal. The Unit was then shut down.