关于by介词短语的成分问题The Fed action followed the third cut in interest rates in six weeks by the People's Bank of China,which said the benchmark rate for one-year loans by commercial banks would fall by 27 basis points to 6.66 per cent.

关于by介词短语的成分问题
The Fed action followed the third cut in interest rates in six weeks by the People's Bank of China,which said the benchmark rate for one-year loans by commercial banks would fall by 27 basis points to 6.66 per cent.
在美联储减息之前,中国央行(BPOC)6周来第三次下调利率.中国央行宣布,将商业银行一年期贷款基准利率下调27个基点,至6.66%.
请问中间的by 27 basis points to 6.66 per cent.在句中是做什么成分?fall在此是否应该为不及物动词?

by 27 basis points to 6.66 per cent是介词引导的状语,表示动词fall的状态
fall在此处是不及物动词,表示自身的降低