Hi Dima,
The public available information regarding marking of NXP devices is the included on the section “Ordering information” of LPC2148 datasheet; any other values are reserved.
If you are having troubles with the mentioned parts, you should contact your Sales/Distributor.
By the way, below you could find the official NXP Distributor Network. Just the parts bought with official distributors are supported, although, as the LPC2xxx are now legacy devices, the support is limited:
Distributor Network|NXP
Hope this will be useful for you.
Best regards!
/Carlos
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