No joy here, but I saved the bread crumb trail. Synopsis: Delete 419, add it back, something gets displayed but an NPL SHOW KEYSET doesn't show it:
GENERAL
choose mode
0 - UPDATE
1 - DISPLAY
2 - ADD
3 - REMOVE
5 - SHOW
7 - ERASE
*: 3
FROM OLD DIAL# - 419
TO OLD DIAL# - 419
NUMBERS REMOVED
GENERAL
choose mode
0 - UPDATE
1 - DISPLAY
2 - ADD
3 - REMOVE
5 - SHOW
7 - ERASE
*: 2
FROM NEW DIAL# - 419
TO NEW DIAL# - 419
NUMBERS ALREADY DEF ? (Y/N) n
0 - TRUNK 1 - SLT
2 - KEYSET 3 - KEYSET_V_PAGE
4 - TRUNK_GRP 5 - HUNT_GRP
6 - BOSS_GRP 7 - PUBLIC_LIB
9 - FEATURE 10 - EDIT
11 - BELL 12 - PAGE
13 - MODEM 14 - DID_NUMS
16 - DATA_PORT 19 - PRIVATE_LIB
20 - KEYSET_Z_PAGE 21 - RELAY
22 - DATA_USER 23 - DATA_GRP
30 - CONF 31 - DVMS_MSG
32 - DVMS_PORTS 33 - PAGE_Q
35 - GROUP_CALL 36 - DIAL_SERV
37 - ROUTING_ACC 38 - WAIT_QUE
39 - NETWORK 40 - WIRELESS
41 - IP_KEYSET 42 - IP_SLT
43 - IP_LGS 44 - IP_KEY_VPG
choose type
*: 2
ENTER (SHELF,SLOT,CKT) - 0,5,7
FROM DIAL# TO DIAL# TYPE INDEX#/SHELF,SLOT,CKT/NODE#/index,ckt
6000 6425 PUBLIC_LIB 0
6426 6441 PUBLIC_LIB 428
498 498 PUBLIC_LIB 426
GENERAL
choose mode
0 - UPDATE
1 - DISPLAY
2 - ADD
3 - REMOVE
5 - SHOW
7 - ERASE
*: 5
0 - TRUNK 1 - SLT
2 - KEYSET 3 - KEYSET_V_PAGE
4 - TRUNK_GRP 5 - HUNT_GRP
6 - BOSS_GRP 7 - PUBLIC_LIB
9 - FEATURE 10 - EDIT
11 - BELL 12 - PAGE
13 - MODEM 14 - DID_NUMS
16 - DATA_PORT 19 - PRIVATE_LIB
20 - KEYSET_Z_PAGE 21 - RELAY
22 - DATA_USER 23 - DATA_GRP
30 - CONF 31 - DVMS_MSG
32 - DVMS_PORTS 33 - PAGE_Q
35 - GROUP_CALL 36 - DIAL_SERV
37 - ROUTING_ACC 38 - WAIT_QUE
39 - NETWORK 40 - WIRELESS
41 - IP_KEYSET 42 - IP_SLT
43 - IP_LGS 44 - IP_KEY_VPG
ALL
choose type
*: 2
FROM DIAL# TO DIAL# TYPE INDEX#/SHELF,SLOT,CKT/NODE#/index,ckt
100 122 KEYSET 0,8,0
401 401 KEYSET 0,6,13
402 403 KEYSET 0,6,1
404 404 KEYSET 0,5,11
405 405 KEYSET 0,5,2
406 406 KEYSET 0,5,0
407 407 KEYSET 0,7,3
408 408 KEYSET 0,5,1
409 409 KEYSET 0,6,6
410 410 KEYSET 0,5,13
411 411 KEYSET 0,6,11
412 412 KEYSET 0,5,3
413 413 KEYSET 0,7,7
414 414 KEYSET 0,6,5
415 416 KEYSET 0,6,14
417 417 KEYSET 0,7,0
418 418 KEYSET 0,7,5
421 421 KEYSET 0,7,1
422 422 KEYSET 0,6,4
423 423 KEYSET 0,7,6
424 424 KEYSET 0,6,9
425 425 KEYSET 0,6,8
426 426 KEYSET 0,7,2
427 427 KEYSET 0,6,7
428 428 KEYSET 0,6,3
429 429 KEYSET 0,6,12
430 432 KEYSET 0,5,4
433 433 KEYSET 0,7,4
434 436 KEYSET 0,5,8
437 437 KEYSET 0,6,10
438 438 KEYSET 0,5,12
439 439 KEYSET 0,6,0
440 441 KEYSET 0,5,14
555 555 KEYSET 0,8,23
GENERAL
choose mode
0 - UPDATE
1 - DISPLAY
2 - ADD
3 - REMOVE
5 - SHOW
7 - ERASE
*: