(If you find progress and other non-error messages irritating, you can use -q to suppress them)

(You can use the -w option to dump extensions.conf format to extensions.conf.aeldump)
LOG: lev:2 file:pbx_ael.c  line:4131 func: pbx_load_module  Starting AEL load process.
LOG: lev:2 file:pbx_ael.c  line:4138 func: pbx_load_module  AEL load process: calculated config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:4146 func: pbx_load_module  AEL load process: parsed config file name './extensions.ael'.
LOG: lev:3 file:pbx_ael.c  line:2235 func: check_switch_expr  Warning: file ./extensions.ael, line 58-58: A default case was automatically added to the switch.
LOG: lev:3 file:pbx_ael.c  line:938 func: check_dow  Warning: file ./extensions.ael, line 67-67: The day (m0n) must be one of 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', or 'sat'!
LOG: lev:3 file:pbx_ael.c  line:896 func: check_timerange  Warning: file ./extensions.ael, line 78-78: The end time (25:00) is out of range!
LOG: lev:2 file:pbx_ael.c  line:4149 func: pbx_load_module  AEL load process: checked config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:4151 func: pbx_load_module  AEL load process: compiled config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:4154 func: pbx_load_module  AEL load process: merged config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:4157 func: pbx_load_module  AEL load process: verified config file name './extensions.ael'.
LOG: lev:4 file:ael2_parse  line:543 func: main  5 contexts, 16 extensions, 161 priorities